Posting some details in response to questions about the current module. Everything for the CC2500 is on Github. Fish around here and you’ll also find some iOS and Pebble code. Sorry, nothing Android based.
The RFDuino is programmed like any other Arduino, it’s worthwhile to use their usb shield. The CC2500 is controlled via SPI(from the RFDuino), there’s nothing to program.
Project info at Don’s blog.