For me, social bookmarking is not about backlinks but conversion. It may take a while to satisfy a specific audience per social bookmarking site but once you do, you'll get an infinite amount of traffic. It all starts from visiting and getting to know the culture of a particular social bookmarking site
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Register first.. then some of them requires you to activate your registration... after that click submit new story.. then I guess you already know how to submit.. it happens to be like directory submission...
consider stumbleupon and post new unique content. people there love it all. once you get many thumbs up you are on the way to get long term social bookmark traffic.
my favorite one is digg when it comes to index and traffic bringing but the good sites they have a nofollow on their links so its worthless for link juice but great to bring in traffic
try this one out this will surely help you blogmarketingtactics.com/social-bookmarking/social-bookmarking-top-links.html but its your job to know whether they were do follow or no follow...
i found one pligg site it is good indiatopix.com try it here it sends good traffic it is very easy just add the url post some Description.. that it your done with it.
Create valuable content that people will actually want to bookmark on their own. Don't take shortcuts or try to play the system. In the long run, this will lead to a backlash, either by social site users, or in your site's search engine rankings. Good luck!
if you wants traffic from stumblupon, digg etc just add mutual friend on all SMO or with those social bookmarking sites you can bring traffic from their first time. but your digg and stumbleupon article or post must be unique or interesting and for social bookmarking list you can use vmoptions.com social bookmarking list from their.