Reddit - This is Reddit. Pretty much anything you can ever want to look at on the internet can be found here. The community is alright too.
The Sixty One - Artists put up music, and listeners get to listen to their tracks for free and vote on what is good or not at complete random. A good place to find some sweet tunes.
Last.fm - Basically the Facebook of music. Its only good music if everyone online knows you're listening to it.
Radiohead - Pretty much my favorite creators of music in the entire world that are still creating new tunes. On top of being incredibly talented musical geniouses, the band itself has an interestingly creepy aura to everything the create, with their website being no exception.
Chuck Palahniuk - While some of his more recent works may not be instant classics, his early works are fantastic works of fiction. His website is a place for fans to discuss his works, and also find other books by authors that play up to the "Palahniukian" style.
Animal Collective - Another interesting band, this one a bit more obscure though. They are often compared to the sound of dying animals, but something about their sound moves me. Check out their website to find live recordings and videos.