I tell people my favorite is Fantasy but if you look at my track record you'll see I spend a lot more time with Alt. History/Steampunk and SciFi or books that skirt the edge between Speculative Fiction and Fantasy. I like aliens, weird technology and I'm not good at making decisions so *shrug*. I think the distinct lack of Fantasy in my life has to do with the lack of REALLy good dragon books that I haven't already read.
Any non-fiction social sciences books (e.g., history, anthropology, etc.), mythology and folklore, fantasy (but I tend to be very picky. I'm partial to military fantasy), and horror/suspense (but I like only one author in this genre).