I would say the difference between "Brutal" DM and regular DM is Brutal DM is more, well, BRUTAL!! Lower, more gutteral vocals, more blast beats and speed.
Brutal death bands would be : Cannibal Corpse, Deicide, Krisiun, Hate Eternal
04/03: The Acacia Strain(?)
05/13: Slipknot/ Hatebreed (?)
05/26: Metal Alliance (?)
06/05: Aborted (?)