Grime, dubstep, drum n' Bass, instrumental hip-hop, strung-out indie stuff and funky, groovy stuff mostly. Also a lot Ministry of Sound compilations when I'm riding the stationary bike (Addicted to Bass, Chillout 2009, etc.).
Beaty, dark stuff like:
Chase and Status, Pendulum, Caspa and Rusko, Benga, Skream, High Contrast and DJ Krush
More rockish and indie stuff like:
The XX, Gossip, F%$^ed Up (the band),La Roux, and Calvin Harris
Used to be a hip-hop head (and still am) but I can't get into it as much anymore....too negative and shallow for the most part.
Oh yeah and lots of Lady Gaga.....not