I hooked up a bluetooth module similar to this one (http://www.goodluckbuy.com/serial-bluetooth-rf-transceiver-module-r...) to my APM1.
It works quite well at normal bluetooth range of course. Ideal for tuning instead of using the USB.
The idea is to use this bluetooth interface while waiting for my 3DR telemetry set.
Moreover I use this app on my android which allows me to change PID and monitor my APM1. (http://code.google.com/p/copter-gcs/wiki/GUI)
Nice when you are out in the field and you want to change some settings.
I have two of these boards but I can't get them to connect. How are yours wired?
Bluetooth examble don't have to use the iphone connector can go to a battery.