Stop what you are doing and go and book yourself tickets to Cirque du Soleil RIGHT NOW. It was spectacular!
I went with a friend of mine who dabbles in the circo-arts (she does trapeize, silks, pole and whatnot). It was interesting to compare her reaction to the moves the performers were pulling on stage - some things that looked relatively easy were actually the most difficult stunts according to her.
Everything was great, from the costumes, to the music and all of the performances in between. I think my favourite was the trapeize couple. Hmm, or maybe the unicycle ladies. Or perhaps the team the flew around over the crowd.