Best concert ever: Bon Jovi in March 2003. My older sister and I cried. How bad is that? but the show was awesome.
Very close second: Paul McCartney in May 1993. Great show, and HELLO! he's one of the Beatles, so that was pretty amazing.
Other shows I've been to: Fleetwood Mac, Eddie Money, Garth Brooks, Martina McBride, Hootie & the Blowfish (they're from my hometown), Cravin' Melon, Garbage, Smashing Pumpkins, Alanis Morisette (another REALLY good show), Allman Brothers Band (also great), Moe., Widespread Panic, Guster, Leftover Salmon (can you tell I went through a jam band phase?), G-Love and Special Sauce, Jimmy Buffett, Goo Goo Dolls...and I think that's it, but I can't remember. Also lots of little no-name local bands along the way.
I would love to see Better than Ezra, Phish (no longer together, alas), Grateful Dead (with Jerry Garcia, though), Rascal Flats, David Allen Coe, Montgomery Gentry, Ludicris, Outkast, and - how lame am I? - I would LOVE to see a show on the Clay Aiken/Kelly Clarkson tour.