If you can get 20 or so bookmarks, you'll see some traffic Then again, if the site that's getting bookmarked really nice, you could get a lot of traffic from one initial bookmark.
I received a little one time... but it was because 80,000 people visited my site through digg. In retrospect, it hasn't sent me a lot. Free links are always nice though.
I receive quite some traffic from icio although it's all very general traffic; nothing too targeted. So, I guess it hasn't proved very beneficial to me.
Not much for my site, but if your site is interesting enough, you could get a lot of traffic form these social sites
digg is mainly for traffic and I've never used del.icio.us. do you get some free links from it? If so then it's really nice from point of link building. And have you ever used aboutus.org?
I had a site that was in the most popular for a month a few years back (when delicious was in it's prime), and the traffic wasn't that great. All in all remember that delicious is a site for bookmarks, not so much for discovery. People go to delicious to mark sites they like and don't want to lose or forget. A smaller few actually use it to discover new sites, so don't expect much traffic - I wouldn't dissuade you from getting your site high on delicious - but don't expect any major booms in traffic.
I got 10000 visitors in a day from delicious. That is very much huge when I compare to traffic generated from SEO efforts.
pavel_kbc, Ya, It happened because I got listed on Home Page for approx 20 hours. I had a shared hosting space and that's the reason I believe that my website did 404 errors most of the time. It would have been better If my would have been hosted on dedicated server.
I don't get much traffic in del.icio.us even I my article was newly submit. I get more traffic in stumble upon compare to my traffic in del.icio.us