Lets separate the different aspects of the metal list. As we can see it is pretty biased:
Agoraphobic Nosebleed - Frozen Corpse Stuffed With Dope (2002)
Grindcore, Massachusetts USA
Producer: Scott Hull
Relapse Records
Amon Amarth, Twilight Of The Thunder God (2008)
melodeath, Sweden
Producer: Jens Bogren
Metal Blade Records
Anaal Nathrakh, The Codex Necro (2001)
blackmetal, UK
Self-Produced
Earache Records
Baroness, Blue Record (2009)
sludge, Georgia USA
Producer: John Congleton
Relapse Records
Blut Aus Nord, The Work Which Transforms God (2003)
blackmetal, France
Producer: ?
Candlelight Records
Boris, Pink (2005)
sludge, Japan
Producer: ?
Diwphalanx Records (Japan) Southern Lord Records (world)
Converge, Jane Doe (2001)
mathcore, Massachusetts USA
Producer: Matthew Ellard, Kurt Ballou
Equal Vision Records
Deftones, White Pony (2000)
alternative, California USA
Producer: Terry Date
Maverick Records
The Dillinger Escape Plan, Ire Works (2007)
mathcore, New Jersey USA
Producer: Steve Evetts
Relapse Records
Earthless, Rhythms From A Cosmic Sky (2007)
psychedelic rock, California USA
Producer: Tim Green
Tee Pee Records
Electric Wizard, Dopethrone (2000)
doom, UK
Producer: Rolf Startin
Rise Above Records
Goatwhore, Carving Out The Eyes Of God (2009)
black/deathmetal, Louisiana USA
Producer: Erik Rutan
Metal Blade Records
Harvey Milk, Life… The Best Game In Town (2008)
experimental rock, Georgia USA
Producer: ?
Hydra Head Records
High On Fire, Blessed Black Wings (2005)
stoner, California USA
Producer: Steve Albini
Relapse Records
Isis, Oceanic (2002)
post-metal, Massachusetts USA
Producer: Matt Bayles, Isis
Ipecac Recordings
The Mars Volta, Frances The Mute (2005)
progressive rock, Texas USA
Producer: Omar Rodriguez-Lopez
Gold Standard Laboratories, Universal, Strummer
Mastodon, Leviathan (2004)
progressive metal, Georgia USA
Producer: Matt Bayles, Mastodon
Relapse Records
Melechesh, Djinn (2001)
blackmetal, Israel
Producer: ?
Osmose Productions
The Melvins, (A) Senile Animal (2006)
sludge, Washington USA
Self-Produced
Ipecac Recordings
Meshuggah, Catch Thirtythree (2005)
experimental deathmetal, Sweden
Self-Produced
Opeth, Watershed (2008)
progressive deathmetal, Sweden
Producer: Jens Bogren, Mikael Åkerfelt
Roadrunner Records
Orthrelm, OV (2005)
avantgarde, Washington USA
Producer: ?
Ipecac Recordings
Pelican, The Fire In Our Throats Will Beckon The Thaw (2005)
post-metal, Illinois USA
Producer: Greg Norman, Pelican
Hydra Head Records
Pig Destroyer, Phantom Limb (2007)
grindcore, Virginia USA
Producer: Scott Hull
Relapse Records
Queens Of The Stone Age, Songs For The Deaf (2002)
stoner, California USA
Producer: Josh Homme, Adam Kasper, Eric Valentine
Interscope Records
Skeletonwitch, Breathing The Fire (2009)
thrash/blackmetal, Ohio USA
Producer: Jack Endino
Prosthetic Records
Slayer, Christ Illusion (2006)
thrashmetal, California USA
Producer: Josh Abraham
American Recordings
Sleep, Dopesmoker (2003)
stoner, California USA
Producer: Billy Anderson, Sleep
Tee Pee Records
The Sword, Age Of Winters (2006)
stoner, Texas USA
Producer: J. D. Cronise
Kemado Records
System Of A Down, Toxicity (2001)
numetal, California USA
Producer: Rick Rubin
American Recordings