According to the profile in the back of his books, he's written a buncha sci-fi and fantasy books (but more sci-fi).

I recently reacd his Apropos of Nothing trilogy, and it was so funny. I'm not even sure why, but the main character was just awesome. He's a major cynic and pessimist, and with good reason. The end of the third book was a bit of a surprise, although I guess I should've seen it coming. Something has to go wrong, with Apropos as the main character. All in all, the three books were probably the funniest I've read in a while (not including The Dresden Files).