Not sure if everyone is already aware of this....
The 'Drive' Android App has just been updated to work on the 2011/2012 Wranglers - previously it only worked on 07-10.
http://drive02.com/
Displays Trans temp, coolant temp and intake air temp - and can display/clear error codes.
Can also set an alarm on the trans temp if required.
I'm using it with a basic eBay Bluetooth OBD2 sender and it works well.
Cheers
James