Alot of rock, country, African, Nordic, folk, blues, Irish, and various other genres.
The Ipod is great for mixing it all together randomly while I'm at work.
You just reminded me of one cool thing I realized. After I ripped those thousands of songs, I found that I can find out exactly how much of music of what type I have, sort of a way of seeing what my buying habits were over all those years. I didn't realize I have over 2GB of classical and 4GB of industrial.