The SMC card we reviewed does have PPC 2002 drivers (since the card is fairly new, there's not way they'd only issue drivers for the PPC 2000 OS). Though the drivers are for 2002, they do work on 2003, but you won't get the Zero Config WiFi features of the new OS.
The Ambicom and Socket cards have PPC 2003 drivers. The Socket SD WiFi card has PPC 2003 drivers in the box, but for the others, download the PPC 2003 drivers from their web sites.
D-Link has beta drivers out.
-------------------- Lisa Gade Editor in Chief, MobileTechReview