I used to like Digg a lot, but there's so much bias and stupid stuff that goes on over there that I've lost interest.
Does anybody here use Google Directory? It's a pretty neat way to find info sorted into categories. There are usually sections with famous works available online.
Google Directory Google Directory - Society > Philosophy > Online Texts
I also like "The Best of the Internet":
Web 2.0 Mashup: Best of the Internet Today
The free education section has some really cool stuff:
All posts in Berkeley Video Courses category.