Hello,

afaik , no. There are a few cards working under 32bit, but not under 64bit.

A few USB Sticks come with 10.6 64bit Drivers, but they are not native reco. as Airport.

When u really want native 64bit N Wifi u must go the long and hard road. Buy a Pci-Mini to PCI Card and a PCI-Mini Card for a Macbook. ( like this one : http://www.ifixit.com/MacBook-Parts/...Card/IF186-084 ) There have no Antenna, so u have to hack something.
This is not really cheap, and a lot of Work.

I dont do it for my self, but a few friends did it.

Happy Hacking

U wait.... i dont think that this will work like this. I think the Original Apple Card has no Mini PCI Slot. Can someone confirm this?
There are a few Mini PCI Cards for other Laptops, like Dell, with the same Broadcom Chip like the Apple Cards. i will try to find more information.