http://www.engadget.com/2007/05/27/indian-air-powered-city-cat-car-prepares-for-production-run/From the people who brought the $2500 SUV...
I really DO like the idea though. Imagine if we converted all the "24 hour Fitness Centers" machines to make compressed air. (I'll stay away from the obvious "political campaign" generation plant..)
Based on my personal experience with airtools and an upright 60 gallon compressor-- I'm a bit skeptical of the "range" claims--- but hey-- if they are real-- this may be the hottest technology yet. (Or, sadly I fear, a HUGE scam-- like the Dennis Cline waterburning engine-- time will tell)