Bands/Artists I've seen live: U2, Black Eyed Peas, Incubus, Godsmack (2 times), Adema, A Perfect Circle (3 times), DISTURBED, Bloodsimple, Tom Jones (I love a little "What's new, pussycat?"), The Donnas, Jurassic 5, Jane's Addiction, Audioslave, Burning Brides, Human League, Deep Purple, No Doubt, LIT, 30 Seconds to Mars
I'd say that my top 3 favorite shows were:
1: U2/Black Eyed Peas - The 360 tour was hands down the BEST concert going experience ever. BEP kicked it off party style and U2 just did not disappoint. They engaged the audience and just brought us all in on their "spaceship". It was unforgettable.
2: Tom Jones - I saw Tom Jones in Las Vegas and he put on one hell of a show. He did mostly covers of different genres of music, sprinkled with his classics and a bit of storytelling. He was just a lot of fun to watch and the man has moves! I'd see him again.
3: A Perfect Circle - It's Maynard. That's enough for me.
As for bands I'd love to see live... I'd love to see Coldplay and Radiohead. Radiohead is on tour next year, so I'm hoping to catch a date during their tour of the States.