I have been about ready to jump on an Aeroforce for a couple of months, but just didn't want to drop the $$$ for it, plus I would need to mount it somewhere, and the wife would notice if it was, etc... Anyway, I've downloaded the few OBD apps for my Droid Incredible (running 2.1 but should be 2.2 by the end of the week according to Verizon).
I too am wondering about which Bluetooth adapter is best.
This one was linked back in like May or something. But now I am hearing that some people are having issues with some of them shutting down or something.