http://www.allthatisheavy.com/
This site is all about heavy metal. It ranges from Doom to Stoner Metal. Think Candlemass; Monster Magnet, Black Sabbath & Neurosis. It has a wonderful variety in that area.

Bands=Albums in pic below From biggest to smallest
Nightstalker - Superfreak
Neurosis - The Eye of Every Storm
High on Fire - Death is this Communion
Vidunder - Self Titled
Zior - Self Titled
Alter of Oblivion - Salvation
Acid King - Sucking the 70's
Baby Woodrose - Disconnected
Karma to Burn - V
Arc of Ascent - The Higher Key