If you live in the UK and watch Channel 4 you might have seen an advert for their unsigned artist website thingy:
It’s pretty sweet, you can browse through hundreds of artists/bands who haven’t got record contracts and listen to their music (if they have uploaded some) for free.
Alot of them are crap, but there are a few good ones:
http://www.channel4.com/apps26/userpages/UserPage/bands/viewUserPage?resourceId=639412qnx
52 Teenagers - I think they are pretty good, you can download all their music for free from their website (www.52teenagers.com). Some of their Acoustic stuff is really good, especially the Message In a Bottle cover.
http://www.channel4.com/apps26/userpages/UserPage/bands/viewUserPage?resourceId=813437crp
Broadway Project - Again pretty good, more electronic (similar style to Bonobo or Tycho).
Check it out, there’s some pretty good stuff on it