Another option would be an Airport Express hooked up to the G3 with an ethernet cable. That way you have "g" speeds and guaranteed compatibility (no OS 9 drivers to worry about if you use OS 9). It's actually slightly cheaper than a "b" type wireless PCI card, and a lot faster than a USB adaptor over USB 1.1 . The other option is to use the USB adaptor with a USB 2.0 PCI card, but again you might have problems finding drivers if you use OS 9.