Blogger Whale has taken the time to look at thirty-one social bookmarking sites, and has listed them by estimated page views and Alexa ranking. He takes a look at many of the popular sites we have come to know and love like Digg, Reddit, Netscape and others.
Initially hesitant to submit links to social bookmarking sites, I submitted a link to my post on a bookmarking site just out of curiosity. Couple of days later while skimming around Google Analytics reports of my blog I was surprised to see a good amount of readers followed me from my link on that bookmarking site.
If you are looking to find social bookmarking sites that might work better with your content, or just other sites to add yourself onto, then check out his list at Blogger Whale.