Quite a lot! I like a host of the classic bands like Iron Maiden, Judas Priest, Aerosmith, Guns and Roses, Metallica and so on, but I also listen to a lot less known bands like Danko Jones, Avenged Sevenfold, Alter Bridge, Evanescence and Shinedown. Then there are Swedish bands like Takida, In Flames, Plan 3 and Sabbaton that I quite like. My latest love is a band called Halestorm.
I don't JUST listen to metal though! As I said before I love opera and I listen to Simon and Garfunkel, Pink, Hootie and the Blowfish, Leonard Cohen, REM, U2 and the Cranberries on a regular basis too.
I don't "get" techno, house, pop, hiphop and R'n'B much though, which tends to dominate in here. Doesn't do it for me.