...but it seems to me the newer sites Aldon cited are more about moving information than considering it. I could get very addicted to digg, but it's not at all contemplative. An older site like Plastic was all about disucssion, with the rating of the comments being kind of the big thing. Plastic feels like it's shriveling up a little, although I could not find any acknolwedgement of that.
I'm geeking out today.