Here's what you need: one strong rope and one pair of rollerblades.
Here's what you do: find an art car that is willing to let you tie your rope onto the back. Go out to the playa where there aren't any people. Go fast. Results are fucking awesome, though they include scars as a result of soft spots on the playa not working well with seven dollar thrift store roller blades.
It was after my initial experimentation in 2007, however, that I found these:

OFF-ROAD ROLLER BLADES.
Now I'm not advertising, but I WANT THESE. They seem perfectly designed for the playa, and could make playa rollerskiing seriously fantastic (though it would probably be best outside of the Burn week itself, when there are too many people to really make this a safe idea).
I just wanted to share this with you, because I have never seen these on the playa and they seem really cool.