Found on Hack-A-Day, from the Magic Smoke blog page.
I like this idea. These RF modules are about a buck a piece and use an SPI interface. This should be easily adaptable to a PIC processor and Swordfish Basic.
This compact PCB interfaces a low power MSP430G2553 microcontroller with a Nordic NRF24L01+ 2.4 GHz radio frequency transceiver module. It's well adapted to serve as a wireless sensor node, but has enough I/O options to be put to use wherever a small microcontroller is required. Available soon from Tindie!