 Don't give up hope! Unless Apple has changed something recently, as of last summer Apple made it so the standard Airport Extreme driver will recognise ANY 000.00g (and only g) PC card based on the Broadcom chipset. This happened just around this time last year. It definitely worked with a Linksys card and my old TiBook (in fact, the exact same model you have). Heck, it worked with a Japanese version of the Linksys card! If I remember, D-Link cards would not work (since they weren't based on Broadcom). 