Open Source 802.11g Wireless Project
Checkout the open source wireless project (http://sourceforge.net/projects/at90usb-zd1211/) that I developed using the AT90USB and ZyDas ZD1211B 802.11g wireless chipset. The total off-the-shelf hardware cost for this project is about $50. Just download the latest release compile it using the AVR GNU or IAR AVR Embedded Workbench compiler and flash to the AT90USBKey (AT90USB1287 Development Board). Connect the ZyDas ZD1211B based USB 802.11g wireless module to the AT90USB with the provided USB cable. I recomend using the Zonet ZEW2501 or Safecom SWMULZ-5400 (see http://zd1211.ath.cx/ for a complete list).
I am hoping that someone will help me maintain this code and work on it. Please contact me david@wibotics.com if you are interested in becoming an admin so you can checkout code.