I took Susan the Demon Child to see Pilobolus this evening. She'd never seen them before but was very impressed. I've seen them once or twice before in concert and several times on PBS (the first time was in 1977 and I was enthralled) and I've loved them every time. It's difficult to explain them if you've not seen them, but their style is based on phenomenal combinations of people and lots of movement. It's rather acrobatic at times, but that's hardly all of it. You should look through the website to see the pictures that are there and then realize that everyone's moving all the time. I didn't see anything in the way of videotapes, but there are a few films of them that appear on PBS and Ovation and so on every so often that are a pleasant hour of your life spent watching amazing dance.
(Note: The dance troupe is named after the Pilobolus mushroom, which is a fascinating thing. The connection's a bit tenuous, but wotthehell, wotthehell.)
If you like Mummenschanz, you'll also like Pilobolus... but for very different reasons.