on the offical website they have a list of bands you can vote for to be on the sounds of the underground 2006 tour
this seems like it might give some clues to the lineup
As I Lay Dying
Between the Buried and Me
Black Dahlia Murder
Bleeding Through
Bury Your Dead
Children of Bodom
Chimara
Devil Driver
Dillinger Escape Plan
God Forbid
Gwar
Hatebreed
Killswitch Engage
Lamb of God
Mastadon
Norma Jean
Opeth
Throwdown
Trivium
Unearth
Sounds of the underground lineup voting