I can recommend www.fastbutter.com , the site is in beta and we are currently going to do some minor change so the visitor will know that the site offers you to both submit your link and write your very own article. You can see this as digg+ezine for now.
FastButter are using dofollow for now. But be aware: to much spamming of Dofollow resources will not give you results...not only that, it hurts the entire community, and it persuades Dofollow providers to convert their sites to Nofollow.
I'm not interested in spamming, when it comes to SEO. What I am interested in is a dofollow link on a profile. That's worth ten times a pile of spam links.
Yeah that´s true, I agree, once a visitor click on your profile,and then your link, he or she must be interested in you somehow, and only tha´s worth as you say 10x. FYI The whole site is dofollow for now.
The point is the backlinks potency. A link on a single page that has many other pages pointing back to it is worth more then spam link who are on far less important pages.
here is my favorite list: http://www.digg.com http://www.clashtalk.com http://www.fark.com http://www.reddit.com
I've got to tell you, its getting boring seeing, all the digg/fark/twitter type clones out there. I want something new, I'd like to make something new... But Ideas and innovation are hard to come by when we live with a heavily saturated "I want to make money, so let me copy someone else" internet world. - a little off subject but yeh..
Thanks for sharing some of the bookmarking sites in this thread. I've been looking for such since some of what I had collected are not working anymore and some of them are park and abandoned by they're owners.
Try MeltedBrain.com , You can submit links to videos, articles, news, etc. and it's pretty easy to get listed.