Have you been to Burning Man? How about with kids? My friend Rachel brought her toddler daughter last and had a blast, though it required a lot of preparation. I've not been myself, so I found some links that will help you decide if you should (and could) go to Burning Man with your kids.
The official Burning Man site has information on bringing the kids.
Red Tricycle has an excellent post (with pictures) as well.
Here are other blog posts about it, mostly positive. But not everyone is supportive of people bringing kids to Burning Man
Camping with kids at Burning Man
Black Rock Kids
The Mommy Files
The Intrepid Mompreneur
Worldwide Hippies (not so supportive of bringing kids)
Theme camps and villages at Burning Man (official site)
Should you bring your kids to Burning Man?