Peerflix - trade DVDs you don't want for ones you do. I just traded two old Baby Einstein DVDs for "The Departed."
Nolo - tons of free legal info on almost any subject you need
Television Without Pity - all your favorite shows deconstructed, logged, summarized.
Memo To Me - free e-mail reminders when you need to remember something important.
What Would Tyler Durden Do? - daily celeb blog, ruthless and hilarious. Not always safe for work.
GFY - chances are, you will need to direct someone here sooner or later.
Deep Discount (DVD/CD/videogames) - prices aren't as good as they once were, but are still lower than most anywhere else you can find, and FREE SHIPPING. I just bought 7 movies for $35.
Gorilla Mask - links to crazy crap every day. Not safe for work.
Revver - the other YouTube, but they pay for video submissions.