An abridged list, I used to go all the time.

High School:
Ratt, Guns-n-Roses, Metallica, Poison, Van Hallen and The Dead.

Since:
Beck, Marilyn Manson, 1 Ozz fest, Ozzy on his own, 2 Lalapalooza's, Smashing Pumpkins, Live, Veruca Salt, Garth Brooks (WTF is he doing on this list, dont ask), Violent Femmes, Pearl Jam, Soundgarden....there are more, but i cannot recall.

Oh, oh and my best concert ever...Eric Clapton, he played for almost 3 hours!!

__________________
Love...the slowest form of suicide.