Drivers offered that allow Mac OS X to use 802.11a, g cards with Atheros chipsets: Mac users haven't had access to 802.11a yet, especially with Apple's CEO declaring 802.11a a dead-end technology back in January 2003. Broadcom makes the chips for Apple's AirPort Extreme hardware, and you can use non-Apple Broadcom-based PC and PCI cards with Macs.
The OrangeWare driver lets users try out (for 10 minutes) a driver they put together for 3Com's Mac OS X users. The driver supports a host of cards from D-Link, NetGear, and other, including g-only and a/g cards. Permanent use of the driver is $15 per unique computer.