Oh, a new one. Rock and metal makes up a relatively large chunk of my CD collection. Mainly metal though. Summary of my metal tastes:
Black metal - Of the misanthropic variety. Old school Norwegian (in particular Mayhem), the new have French stuff (such as Blut Aus Nord; I'm not talking LLN which does not deserve the legendary status), and American stuff (Leviathan, amongst others). A few of the classics also.
Death metal - Of the technical variety. Cryptopsy, Gorguts, Psycroptic, etc. Also of the old school variety, Autopsy being the undisputed kings of this.
Grindy stuff - Carcass, Carcass, Carcass. Some other stuff too.
Prog metal - Dream Theater, Shadow Gallery, Symphony X, Kamelot etc. I can handly power, provided there is a strong prog leaning to it.
Thrash metal - Crossover thrash mainly. Destroyer 666 are as good as it gets for me.
Rock-wise:
Post rock - My favourite just now. Godspeed You! Black Emperor still hold the title for me.
Prog rock - Porcupine Tree, Rush, what have you. Nothing beyond the standards here really.