For those of you who expressed interest in my home-made ZigBee radios, I've now posted all the project details (parts lists, board design, SW , etc.) on the AVR Freaks site in the Projects area. You have to sign up to access it, but you know you should anyway. Great for all things AVR.
Here's the link: http://www.avrfreaks.net/index.php?module=Freaks%20Academy&func=viewItem&item_id=2812&item_type=project
Enjoy!