I go to concerts quite regularly..
I went to Warped Tour a few weeks ago (saw Yellowcard, New Found Glory, Tiger Army, Amber Pacific, Bad Religion, The Briggs, and Pennywise... ended up with set lists, guitar picks and towels from many of those bands) and a week from Monday I'll be seeing Rush for the 4th time..
The best concert I've ever seen was Whole Wheat Bread and the Bouncing Souls.. I got to get on stage durring a song and sing along with the Bouncing Souls.. that was one of the most amazing moments ever..
other great concerts include
Social Distortion, Tiger Army, and The Explosion
Halfway Decent (my old band) The contingency Plan and Unsung Zeroes (they are one of my favorites)
anytime I've ever seen Flogging Molly
Less Than Jake, Sugarcult, Yellowcard and the Teen Idols (this was way before Yellowcard and Sugarcult were huge..i want to say summer of '02)
Rancid
hmm... Pennywise has always been a good show too.. saw them one time and they had to stop playing because we were literally tearing the place down.. it ruled..