My father just recently got a G4 Mac from his work which is lacking in the Wireless Networking department. I know nothing about macs so i was hopeing someone around here would have any suggestions on an affordable Network card or USB adapter compatible with macs.
Try posting your query on the netgear.com wireless adapter user forum -- moderator there (jmizoguchi) uses Macs.
Alternatively there are Mac specific user forums around.
The only non-Apple wireless adapter stocked by the main Mac dealer in Central London was Belkin -- but we could find no reference to Apple on the Belkin site (this was a few years ago and may have changed).