Coming to the Burning Man 2007: OrbSwarm (also known as SWARM).

SWARM is a funded large scale kinetic art project for Burning Man 2007. It consists of a number of rolling spherical vehicles, actuated by a non-rolling interior with a counterweight. With GPS guidance and computer control, the spheres can execute motions evocative of animals and dancers.

Huge ball things dancing in patterns across the desert, guided by GPS? Damn, I hope I can afford to go, just to see that!

Also sounding very fun is Burninator X:

The Burninator X is a very large scale fire installation currently under construction, for installation at Burning Man 2007. It will be a 2-dimensional set of flame towers arranged in a cross, in an area of approx. 1/2 million square feet. It will produce 2-D patterns and sequences of flame, visible for miles.

On a slightly more environmentally friendly note, Apocalypse Stagecoach is ‘bicycle powered stagecoach theatre’ who will be performing ‘Puppet Shows For The End Of The World’. That’s my kind of entertainment… And it’s nice that it’s not completely destroying the environment while it’s doing it.