I used to work at a concert venue, so I've seen lots. The first concert I ever worked was Jimmy Buffett.
KISS
Peter Gabriel
311
Jay-Z
Depeche Mode
Goo Goo Dolls
Dave Matthews
Boston
Tool
Smashing Pumpkins
Belle & Sebastian
Cold War Kids
We Are the Fury
The Sounds
Placebo
Death Cab for Cutie
Deftones
The Fall of Troy
Nada Surf
She Wants Revenge
Foxy Shazaam
Silverchair (I was lucky to see them twice before they broke up)
Ra Ra Riot
Bat For Lashes
Jaguar Love
Threaded Mode