White base stations actually do have AirPort cards installed. I have taken one apart to extract the card, and it looks exactly like a retail AirPort card, and works fine in an iBook AirPort slot.Just one thing, AirPort Base Stations don't have actual Apple AirPort cards in 'em, they have Lucent WaveLAN cards instead. Still neat though - they're 16 bit PCMCIA 802.11b cards that'll work on just about every laptop out there with PCMCIA slots.
I think the Graphite bases have WaveLAN cards though, and that will be really cool, because I can use that in my PowerBook 1400.