I know there are a lot of metalheads on GFY. I am a HUGE metal guy, some of my favorites are (in no particular order):
Ones you may know: Slayer, old Metallica, Carnivore, SOD, Black Sabbath (up to Born Again), Anthrax, Celtic Frost, Clutch, System of A Down, Pantera, Down, Kreator, Dark Angel, Municipal Waste, DRI, Mastodon, Moterhead, Sepultura / Souldfly, Obituary, Snot, Exodus
Lesser known bands I always thought should have been bigger: Holy Terror, Wargasm, Whiplash, Sacrifice, Exhorder, Sadus, and Dream Death
If anyone wants to talk metal, our twitter could always use more juice...
http://twitter.com/#!/DickDBand
If anybody know other lesser known band I might have missed, I always like to check that shit out!