My favorite genre is Rock, without a doubt. Post rock would be my favorite sub genre, and instrumental rock would be my favorite "type." For the past three years, I've been listening to solely Japanese Rock, and been enjoying it tremendously. Always trying to find new music too. I have a thing for non-mainstream indie music.
Edit (10/21/2009): I started getting back to classic rock, and now I'm rocking everything from the 60s. It feels good. :D.