The Freakduino-Chibi is an oddly-named Arduino-compatible board with a built in 2.4GHz radio, plus a software stack implementing the 802.15.4 (Zigbee) protocol. The designer had remote sensing applications in mind, but it looks like a pretty reasonable foundation for the walkie-textie project – lots cheaper than the combination of an Arduino Fio and an Xbee module.
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