I run an Asus WL-500GP v1 with an Atheros mini-PCI card for it's 802.11a capability. Is anyone working on a version of Tomato that will support Atheros wifi, perhaps using the madwifi driver utilized in openwrt? Without a tutorial, I am afraid it is beyond the scope of my knowledge/experience. I would be surprised if some clever person is not working on it, however. Just putting it out for comment.
Note: I also posted this over at linksysinfo.org in the Tomato forum in the hope that it would find more interested people.