I started my search here:
http://www.fsf.org/resources/hw/net/wireless/cards.html
And chose the
Asus WL-107G PCMCIA card which was simple to setup in Linux. It looks like NewEgg no longer carries this card though.
Backordered at Provantage too. Macmall and Buy.com both have it back ordered as well.. I wonder if it's no longer available or if they are getting ready to switch the Chip so it will no longer work..
(Manufacturers regularly keep the model number and change the hardware and revision number so a card you think will work Doesn't, so if a Revision is specified, make sure you get the proper one.)
Well that being the case, go back to my first link (Free Software Foundation) and choose something from that page that has a free Driver available.