epitonic.com - epitonic has lots of free, legal mp3s from lots of kewl bands and lots of info about them.
they specialize in indie, math and whatnot. kewl.

transmission3000.com - transmission3000 has lots of free, live mp3s from kewl bands. kewl.

buddyhead.com - buddyhead is a website with reviews and interviews and stuff. 
they aren't very nice in most of their reviews.