I'm not sure about the no-follow attribute in social bookmarking sites, so I'll need to check on that. I expect people to start gettting banned ( of course does not really do anything since most are signing up with multiple email accounts anyway. I social bookmark my sites but mostly for traffic, but I've noticed that once you Bookmark a site the search engine spider always seems to follow close behind.
My main purpose is not to just get the SE to come( I can always just throw a link on one of my PR6 sites and make that happen anyway), I do it more because in the early days of a site before you get indexed, then if you bookmark correctly and have interesting content, then you can get some traffic and maybe even a few backlinks from the blogs and sites of people that happen to see your site and maybe read an article or two.
Bruce
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