i haven't been to any of their concerts but i've heard these are the best:
The Roots Wu Tang Clan Rage Against the Machine Hieroglyphics Visionaries Jurassic 5 MF Grimm, Kurious, MF Doom (together)
STI
StinkFist462Your Mom
Bloodhound Gang Mindless Self Indulgence Mars Volta Blood Brothers Autolux
RED
RedAlertv2Senior Member
Green Day Avenged Sevenfold Offspring Fallout Boy The Matches
COO
cool_dudes_ruleSenior Member
feeder green day trivium
and i cant think of any more...
OTA
OtakuSkyhighatrist
Iron Maiden
RED
RedAlertv2Senior Member
also mxpx
LAN
Lanamordrem
I've seen Queens of the Stone Age and Mindless Self Indulgence and both were awesome live.
VVD
Victor Von DoomLatverian Diplomat
The best bands I've seen live, IE above all the others I've seen, are:
Rammstein, Tool, Fantomas, Radiohead, Audioslave, White Stripes.
STI
StinkFist462Your Mom
the second time i seen NIN (10/11, Xcel Energy Center) they didnt impress me at all really. i seen them before in Chicago in may. they greatly impressed me then, but the setlist barely changed and the drummer wasnt all that great.