I just remembered something I always wanted to know but could never trace reliable information for. I'm going to post it here since it's relevant:
I've read that the original AirPort cards were PCMCIA with some of the pins mixed around so it couldn't work in a normal PCMCIA slot nor other cards in the AirPort slot. Does anyone know what the difference in the pinouts actually was? If I could ever find this out I would be interested in taking some scrap parts and wiring up an in-line adapter to allow such conversions. It might open up the possibility of alternative use of the AirPort slot in the otherwise expansion-crippled G4 Cube, as one practical example.
On another related note, and I did a lot of research into this theory, were the first AirPort Extreme cards based on Mini-PCI, just with a non-standard connector? There was a reduced-pin-count variant in the specification that seems to match up with the pin-count of the AP Extreme. My thought was that the AP Extreme slot on a motherboard could possibly be re-purposed for some other Mini-PCI device instead. Hackable expansion for iBooks and Mac Mini's, anyone? Maybe I'm dreaming too much...