I recently purchased (on eBay) an "802.11G WiFi USB 2.0 Dongle 5 dBi Antenna 4 Mac PSP NDS," to use with a G3 clamshell iBook running 10.3.9. This dongle comes with the Zydas 1211 driver and software. I followed the directions carefully, but after installation, the Network System Preferences panel did not recognize the driver or the device.
After hours of troubleshooting, I downloaded the AirPort software, which was not on the clamshell, and this fixed the problem. This is not mentioned anywhere in the Zydas documentation.
Mac OS X Hints
http://hints.macworld.com/article.php?story=20070523154246381