So having been I highly recommend Burning Man to pretty much anyone who enjoys awesome stuff. Such a grand and interactive arts festival like nothing I've ever seen. My favorite sights off hand were a giant game of Tetris that you played standing on top of a huge L-piece that you climbed two ladders to get on top of... that and a car about the size of 5 buses that blasted techno and resembled a metallic duck with a disco-ball head, complete with flaming mohawk.
I don't have any pictures of these awesome things on hand, but I'll try to post them as they become available on the inter-web. If you see any, let me know!