Momixa - Pick two songs and get the perfect mix
Bandcamp - Discover amazing music and directly support the artists who make it.
Liveset Database - Database site with tracklists from Dj sets
SoundCloud - Enjoy music & follow favourite artists
FIEND.fm - "Hot or Not" for music discovery: 2 hrs of tracks in 2 mins
Pandora - Pandora Radio is a free (ad-supported) internet radio founded in 2000.