It depends. I tend to have one or more genres in heavy rotation, and then I'll move on to something else. Overall, I listen to most types of music including trance/jungle, metal (esp. death), rock (classic and otherwise), rap, r&b, ska, punk (real and poppy poser punk. I'm not afraid to admit I listen to emo), reggae. If it sounds good, I'll listen. Just depends on my mood.

Lately I've been listening almost exclusively to r&b and hip-hop.