I just installed this app on my iPod, I'll let you know what I think in a couple days. I can't wait to drive my car now. Too bad the battery is dead in my iPod.
http://www.autoblog.com/2008/07/29/dynolicious-turns-iphone-into-cheap-performance-meter/
http://www.autoblog.com/2008/07/29/dynolicious-turns-iphone-into-cheap-performance-meter/