Have you run across the REV app for the iphone, yet? It promises an ODB wireless for the iphone that allows reading/resetting codes, reads real time info from the engine, has internal iphone accelerometer data (acceleration, gps mapping, g-forces, time to 60/100, etc).
I'd be interested in comments from others as to how useful this iphone app will be.
Wireless ODB claims to start shipping in November.
http://devtoaster.com/products/rev/index.html
Jim