I've been playing more and more with this del.icio.us-like community bookmarks site and absolutely love the design, usability, and content:
http://www.digg.com

Basically, you "digg" up a link, and if many others dig up the same (there's some content matching technology when you submit a link so you won't submit older stories), the link gets promoted to the top of the homepage.

Its pretty good, some things make you wonder "how the eff did that get on the home page" but in general its good for links. But for actual news it tends to be behind the power curve.

I'd be interested to know more good sites like this one. Of course, there's del.ico.us/popular...

It's possible that it remains behind the power curve because it hasn't obtained critical mass yet. There are also some technical limitations that might be problems – for instance, it doesn't seem like articles can contain more than one link, and comment moderation is a little bizarre. It would be neat to see a digg/slashcode hybrid, perhaps one that takes slashcode and it's comment/moderation/metamoderation system (which has worked really well for /. comments) and applies it to the initial story as well. Slashcode is pretty mature and already somewhat close to what Digg is. Well, without the spiffy ajax and what not :)