I listen to IDM, breakcore, contemporary jazz (Not a big freeform fan), some metalcore/hardcore/deathcore, ambient (Such as Boards of Canada), soundscapes, and a small amount of punk.
My favorite artists according to my Last.fm (Username is DDRmaster117 if you care):
Boards of Canada
Dave Matthews Band
The Flashbulb
Sabrepulse
Squarepusher
NOFX
Aphex Twin
Dream Theater
Autechre
Motion City Soundtrack
Bad Religion
Imogen Heap
Demon Hunter
Venetian Snares