It's not true that any WiFi card will work. Ideally you want to get an 802.11g card with the Broadcom chipset, so that it will work without any extra drivers. My Linksys WPC54G worked out of the box, with all capabilities (802.11g, WEP, WPA). The thing is that manufacturers often switch chipsets inside their cards without telling anyone. In order for it to work out of the box, it needs to have the Broadcom chipset, because this is what Apple's AP Extreme cards have. I got lucky, mine had the Broadcom chipset. So finding a working card can be trial and error. I bought my card 2 years ago - I have heard of 54g cards from Linksys, Belkin, and others working around this time period. The D-Links used the Intersil chipset which didn't work. Who knows what card uses what chipset now, unfortunately...