Sites like digg.com, reddit.com, stumbleupon.com etc can bring you a LOT of traffic. How about getting 20,000 and more visitors a day when your listing hits the front page?
Getting to the front page of these sites is not as difficult as it seems. I have been successful with digg and del.icio.us (and not so much with Reddit though the same steps should apply to it as well) multiple times and have thus compiled a list of steps that have helped me succeed:    
1Pay attention to your Headlines
  Many great articles go  unnoticed on social bookmarking sites because their headline is not  catchy enough. Your headline is the first (and very often the only)  thing users will see from your article, so if you don't make the  effort to provide a catchy headline, your chances of getting to the  front page are small. 
Here are some examples to start with :-
Original headline : The Two Types of Cognition
Modified Headline : Learn to Understand Your Own Intelligence
Original headline: Neat way to organize and find anything in your purse instantly!
Modified Headline : How to Instantly Find Anything in Your Purse
Here is a good blog post that should help you with your headlines.
Here are some examples to start with :-
Original headline : The Two Types of Cognition
Modified Headline : Learn to Understand Your Own Intelligence
Original headline: Neat way to organize and find anything in your purse instantly!
Modified Headline : How to Instantly Find Anything in Your Purse
Here is a good blog post that should help you with your headlines.
2Write a meaningful & short description
  The headline is very important to draw attention but if you want to keep that attention,  a meaningful description is vital. The description must be slightly  provocative because this draws more attention but still, never use  lies and false facts to provoke interest. For instance, if your  write “This article will reveal to you the 10 sure ways to  deal with stress once and forever and live like a king from now on.”  visitors will hardly think that your story is true and facts-based. 
  
You also might be tempted to use a long tell-it-all paragraph to describe your great masterpiece but have in mind that many users will not bother to read anything over 100-150 characters. Additionally, some of the social bookmarking sites limit descriptions, so you'd better think in advance how to describe your article as briefly as possible.
You also might be tempted to use a long tell-it-all paragraph to describe your great masterpiece but have in mind that many users will not bother to read anything over 100-150 characters. Additionally, some of the social bookmarking sites limit descriptions, so you'd better think in advance how to describe your article as briefly as possible.
3Have a great first paragraph
  This is a rule that is  always true but for successful social bookmarking it is even more  important. If you have successfully passed Level 1 (headlines) and  Level 2 (description) in the Catch the User's Attraction game, don't  let a bad first paragraph make them leave your site.      
4Content is king
  However, the first paragraph is not  everything. Going further along the chain of drawing (and retaining)  users' attention, we reach the Content is King Level. If your  articles are just trash, bookmarking them is useless. You might  cheat users once but don't count on repetitive visits. What is more,  you can get your site banned from social bookmarking sites, when you  persistently post junk.      
5Make it easy for others to vote / bookmark your site
  It is best when other people, not you, bookmark your site. Therefore, you  must make your best to make it easier for them to do it. You can put  a bookmarking button at the end of the article, so if users like  your content, they can easily post it. If you are using a CMS, check  if there is an extension that allows to add Digg, Del.icio.us, and  other buttons but if you are using static HTML, you can always go to  the social bookmarking site and copy the code that will add their  button to your pages. 
Here is a link that should help you add Links for Del.icio.us, Digg, and More to your pages.
Here is a link that should help you add Links for Del.icio.us, Digg, and More to your pages.
6Know when to submit
  The time when you submit can be  crucial for your attempts to get to the front page. On most social  bookmarking sites you have only 24 hours to get to the front page  and stay there. So, if you post when most users (and especially your  supporters) are still sleeping, you are wasting valuable time. By  the time they get up, you might have gone to the tenth page. You'd  better try it for yourself and see if it works for you but generally  posting earlier than 10 a.m. US Central Time is not good. Many  people say that they get more traffic around 3 p.m. US Central Time.  Also, workdays are generally better in terms of traffic but the  downside is that you have more competitors for the front page than  on weekends.      
7Submit to the right category
  Sometimes a site might  not work for you because there is no right category for you. Or  because you don't submit to the right category – technology,  health, whatever – but to categories like General,  Miscellaneous, etc. where all unclassified stuff goes. And since  these categories fill very fast, your chance to get noticed  decreases.      
8Build a top-profile
  Not all users are equal on social bookmarking sites. If you are an old and respected user who has  posted tons of interesting stuff, this increases the probability  that what you submit will get noticed. Posting links to  interesting articles on other sites is vital for building a  top-profile. Additionally, it is suspicious, when your profile has  links to only one site. Many social bookmarking sites frown when  users submit their own content because this feels like  self-promotion.      
9Cooperate with other social bookmarkers
   The Lonely Wolf is a suicidal strategy on sites like StubleUpon, Digg,  Netscape. Many stories make it to the front page not only because  they are great but because they are backed up by your network of  friends. If  in the first hours after your submittal you get at  least 15 votes from your friends and supporters, it is more likely  that other users will vote for you. 50 votes can get you to the top  page of Digg.      
10Submit in English
  Linguistic diversity is great but  the majority of users are from English-speaking countries and they  don't understand exotic languages. So, for most of the social  bookmarking sites submitting anything in a language different from  English is not recommendable. The languages that are at an especial  disadvantage are Chinese, Arabic, Slavic languages and all the other  that use non-latin alphabet. German, Spanish, French are more  understandable but still they are not English. If you really must  submit your story (i.e. because you need the backlink), include an  English translation at least of the title. But the best way to  proceed with non-English stories is to post them on where they  belong. Check this link for a list of non-English sites.       
11Never submit old news
   Submitting old news will not  help you in becoming a respected user. Yesterday's news is history.  But if you still need to submit old stuff, consider feature  articles, howtos and similar pieces that are up-to-date for a long  time.        
12Check your facts
 You must be flattered that users  read your postings but you will hardly be flattered when users prove  that you haven't got the facts right. In addition to sarcastic  comments, you might also receive negative votes for your story, so  if you want to avoid this, check you facts - or your readers will do  it.     
13Check you spelling
 Some sites do not allow to edit  your posts later, so if you misspell the title, the URL, or a  keyword, it will stay this way forever.         
14Not all topics do well
 But sometimes  even great content and submitting to the right category do not push  you to the top. One possible reason could be that your stories are  about unpopular topics. Many sites have topics that their users love  and topics that don't sell that well. For instance, Apple sells well  on Digg and The War in Iraq on Netscape. Negative stories - about  George Bush, Microsoft, evil multinational companies, corruption and  crime also have a chance to make it to the front page. You can't  know these things in advance but some research on how many stories  tagged with keywords like yours have made the front page in the last  year or so can give you a clue.         
15Have Related Articles / Popular Articles
   Traffic  gurus joke that traffic from social bookmarking sites is like an  invasion – the crowds pour in and in a day or two they are  gone. Unfortunately this is true – after your listing rolls  from the front page (provided that you reached the front page), the  drop in traffic is considerable. Besides, many users come just  following the link to your article, have a look at it and then they  are gone. One of the ways to keep them longer on your site is to  have links to Related Articles / Popular Articles or something  similar that can draw their attention to other stuff on the site and  make them read more than one article.        
16RSS feeds, newsletter subscriptions, affiliate marketing
  RSS feeds, newsletter subscriptions, affiliate marketing are all  areas in which the traffic from social bookmarking sites can help  you a lot. Many people who come to your site and like it, will  subscribe to RSS feeds and/or your newsletter. So, you need to put  these in visible places and then you will be astonished at the  number of new subscriptions you got on the day when you were on the  front page of a major social bookmarking site.        
17Do not use automated submitters
  After some time of  active social bookmarking, you will discover that you are spending  hours on end posting links. Yes, this is a lot of time and using  automated submitters might look like the solution but it isn't.  Automated submitters often have malware in them or are used for  stealing passwords, so unless you don't care about the fate of your  profile and don't mind being banned, automated submitters are not  the way to go.      
18Respond to comments on your stories
    Social bookmarking sites are not a newsgroup but interesting articles can trigger a  pretty heated discussion with hundreds of comments. If your article  gets comments, you must be proud. Always respond to commends on your  stories and even better – post comments on other stories you  find interesting. This is a way to make friends and to create a  top-profile.        
19Prepare your server for the expected traffic
  This is  hardly a point of minor importance but we take for granted that you  are hosting your site on a reliable server that does not crash twice  a day. But have in mind that your presence on the front page of a  major social bookmarking site can drive you a lot traffic, which can  cause your server to crash – literally! 
I remember one of the times I was on the front page on Digg, I kept restarting Apache on my dedicated server because it was unable to cope with the massive traffic. I have many tools on my site and when the visitors tried them, this loaded the server additionally.
Well, for an articles site getting so much traffic is not so devastating but if you are hosting on a so-so server, you'd better migrate your site to a machine that can handle a lot of simultaneous hits. Also, check if your monthly traffic allowance is enough to handle 200-500,000 or even more visitors. It is very amateurish to attract a lot of visitors and not be able to serve them because your server crashed or you have exceeded your bandwidth!
I remember one of the times I was on the front page on Digg, I kept restarting Apache on my dedicated server because it was unable to cope with the massive traffic. I have many tools on my site and when the visitors tried them, this loaded the server additionally.
Well, for an articles site getting so much traffic is not so devastating but if you are hosting on a so-so server, you'd better migrate your site to a machine that can handle a lot of simultaneous hits. Also, check if your monthly traffic allowance is enough to handle 200-500,000 or even more visitors. It is very amateurish to attract a lot of visitors and not be able to serve them because your server crashed or you have exceeded your bandwidth!
20The snowball effect
  But despite the differences in  the likes of the different social bookmarking communities, there are  striking similarities. You will soon discover that if a post is  popular on one of the major sites, this usually drives it up on the  other big and smaller sites. Usually it is Digg posts that become  popular on StumbleUpon and Reddit but there are many other examples.  To use this fact to your best advantage, you may want to concentrate  your efforts on getting to the front page of the major players only  and bet on the snowball effect to drive you to the top on other  sites.
An additional benefit of the snowball effect is that if your posting is interesting and people start blogging about it, you can get tons of backlinks from their blogs. This happened to me and the result was that my PR jumped to 6 on the next update.
An additional benefit of the snowball effect is that if your posting is interesting and people start blogging about it, you can get tons of backlinks from their blogs. This happened to me and the result was that my PR jumped to 6 on the next update.