I've added a bit more information on the project.
Info on the QFM-TRX1-24G you can find here: http://www.quasaruk.co.uk/acatalog/DSQFM-TRX-2.pdf
Info on the CC2500 you can find here: http://focus.ti.com/docs/prod/folders/print/cc2500.html
You can purchase the QFM-TRX1-24G for a couple of euros (for example farnell)