HC-06 Wireless Serial 4 Pin Bluetooth RF Transceiver Slave Module With Backplane
Two for £6.48, arrived in ~8 days from China
Likely to be used as a basic triggering thing for some wee bots.
A useful PDF for setting up basic comms. A guide on arduinohacks. Instructables.
The actual boards that were delivered are a little different, just in the printing on the back. Haven’t used yet.
ebayduino 