Went to:

Tom Petty '05 - HUGE ASS thunderstorm. I got drenched. Lightning hit the stage and shut everything off for a minute. It came back on and they started jamming right where they left off. Quite possibly one of the coolest things I've seen.
Tom Petty '06 - At least 25 people from my hometown sat next to each other and every single person had weed. I was blitzed. I fuckin love Petty.
Steve Miller Band '06 - Very fucking cool.
Def Leppard/Journey '06 - Eh.. it was okay. I went with my girlfriend at the time and another couple. Pretty boring.
John Mellencamp '06 - It was free, tons of people, very fun.

And I'm going to RUSH on August 26th. Can't wait for that one.