I have just released this small but interesting project:
I have been recently involved in several sensor network projects including the Jeenode, Norduino, MSPNode (andy+simpleavr)
and I'm exploring more Bluetooth based solutions for Android related ideas.
The thing can also be interfaced to Xbee and to a base station which will also be based on Arduino.
If somebody is interested to test/play with this thing please let me know as I have few PCBs left.