Just picked this item and I'm rather happy with it, so I thought I'd share.

http://gopointtech.com/

It's a OBD reader that is wireless, and connects to my iPhone via Bluetooth.

The check engine light has been coming on once in a while, so I decided it was time to see what the heck was going on! Turns out it was just a pesky EGR valve - nothing a good tap with a screwdriver handle won't fix, but now I know.

I love technology!
~Noctis