Styx a few years ago. So I called some friends that I knew liked him, and bought a block of tickets.
I was expecting a book tour thing, that covered sort of self-help, take personal responsibility, and stuff like that. But it was actually him talking about what inspired him to write his books, which went all over the map. He's an academic, and started a bit scattered, but as it went on, he started bringing things together and having a coalesced message and it was quite an interesting and fun talk.
Earlier this year, I saw Phil Hansen speak in person (at Adobe MAX). His speech hit me profoundly. It’s a fantastic speech/story about how limitations can expand us. Definitely worth the time to watch (the video).
I've seen Bette, Elton, O, Zoomanity, one or two other Cirque's, couple of reviews, and one or two that are escaping me, but this one was just fun... though as my wife said, both the Beatles and the choreographers did too many hallucinogenics. If you get to Vegas, and like the Beatles Music (and Cirque shows), then this is a must. If you're not a fan of either, then I hear they have gambling, strippers and bars to keep you entertained... along with pawn shops and car customizers.