I saw those, but i'm pretty certain that they're not originlal MF cards, but rather modified retail cards.

Technically any card that can use the original wavelan drivers will work in an airport slot- I'm using a full-length wavelan silver in my clamshell (to get addition reception, and it works wonders)

The sony card (which I'm pretty certain that may be) works as well, and when the antenna is popped off it has 2 antenna jacks, just like the apple original... also a rebranded wavelan - unique only because of its miniature antenna

the taped over card and wifi logo in the corner lead me to believe these are just modified retail cards.

I have a box of unlabled wavelan cards, and there is no logo on the upper side- actually no sticker at all.[/i]