Cut my musical teeth on metal in the early 1990's, and while I now have a very wide and varied taste, sooner or later metal rears its' head again.
My favourite metal bands are, according to my iTunes:
Alabama Thunderpussy
Amen
Anathema
Buck Satan And The 666 Shooters
Cradle of Filth (well, up to and including Midian)
Down
Geisha
Guns 'N' Roses
Hermano
Iron Maiden
Kyuss
Machine Head
Marilyn Manson
Mastodon
Metallica (Excepting the Black album, Load, Reload and St. Anger)
Ministry
Monster Magnet
My Dying Bride
Nailbomb
Nine Inch Nails
Opeth
Orange Goblin
Pantera
A Perfect Circle
Rage Against The Machine
Raging Speedhorn
Sepultura
Slayer
System Of A Down
Therapy?
Tool
Type O Negative
Uncle Acid And The Deadbeats
Viking Skull
White Zombie
Now I know that not all of these are strictly classed as metal, but what is metal really? Heavy, intense, aggressive... I don't know, but I love the above bands and plenty more like them.