Via TED Blog, I found a recent Business 2.0 article that discusses the future Rocket Racing League--NASCAR for rocket-powered planes. When competition begins in 2007, the planes will race around a 5 mile long virtual track (only visible on pilots' radars) and compete for a purse that could be worth $2 million. The founders say they could be bringing in $150 million in revenue by 2010 if they secure the sponsorship and broadcast deals they want. Whatever happens, this is definitely something worth keeping an eye on.
Here's the article: http://money.cnn.com/magazines/business2/business2_archive/2006/09/01/8384340/index.htm