Ytai demoed an IOIO android development board over Bluetooth. Connect the board to your Android enabled device and control various IO pins on the board:
IOIO is a board providing I/O connectivity for Android. Until recently it would use a USB connection for communicate with Android. Yesterday, I announced Bluetooth support, which is achieved by plugging any standard (and cheap) Bluetooth dongle into the USB jack. Using the new feature is a simple matter of firmware upgrade, achievable either with a programmer or with another IOIO.
Via the forum.