http://ansiform.afraid.org/ - anonymous ambient music
http://kahvi.org/ - chill music
http://hellven.org/ - awesome music [though they need to release more often]
http://www.ronincollective.com/ - no real set genres, but it's all good anyway
http://www.camomillemusic.com/ - kind of the same. mostly electronic, but the latest release is... well, kinda weird