I've always known about the airport card slot in the back of my iMac500 and may someday invest in one, but the thought recently came to me that perhaps i could use this as an expansion port for my upgrade-challenged computer. my question is, can this port be used for other CardBus cards, like an airport extreme or firewire800 card? i know very little about the whole mechanism so any information (even a "no you can't stupid, here's why") would be helpful.