Since I seem to be one of the few people here experimenting with Kismac on an intel MacBook pro and OS X 10.4.5, I thought I would share my experiences thus far:
-as advertised, the built-in Airport Extreme card works in Active mode and nothing more, but does active mode quite well
-as advertised, the d-link dwl-122 Prism2 usb card works in active and passive mode "out of the box"
-the old OS X driver supplied by d-link is useful for nothing more than castrating Spotlight - don't install it! Use the driver disc as a coaster whilst watching IV's being collected with Kismac's superior driver instead.
-unrelated to Kismac, know that there is not a way (yet) to change the AirPort Extreme's MAC address. ifconfig won't do it, neither will aspoof or spoofmac. It can be done easily in Linux or Windows and even through Parallels virtualization, but not directly in OS X. I'll report back on this one if I sort it out.
-I still haven't officially cracked any wep keys but I have successfully captured packets, performed authentication floods and reinjected packets. So far, so good!