The Airport card is using a BCM 43 xx Chipset and all the following cards are known to work with the Airport soft :

Asus WL-103B

Asus WL-100G (classic)

Belkin F5D7010 (first version only)

Belkin F5D7011

Belkin F5D7011FR

Bewan Wifi PCMCIA 54

Linksys WPC54G V1

Linksys WPC54GS

Microsoft MN-720

Motorola WN825G PC Card

Sagem WPCB-128G

Sony Ericsson GC79

Tecom WL5021

Trendnet TEW-401PC

Trendnet TEW-401PCPlus

And the usb D-link DWL-g122 is working too