[squishy] sent in his iBook refit project. Normally a laptop ressurection wouldn't grab my attention, but the wireless card caught my eye. Because his ebay deal didn't come with an airport card, he refitted it with a Senao 200mW wireless card. The card just fit - and with some dremel work on the antenna connector, it was plug and play under linux.
http://www.hackaday.com/2007/02/16/ibook-wireless-retrofit/