I'd love more than life to do that, but instead of pay for the damned wireless network adapter for my xBox, I bought a new LinkSys WRT54G router, stuck it on my computer, took my WRT54GL and put "homebrew" firmware on it, and set it as a wireless bridge. The xBox now sees that it has a wired connection and I'd probably have to go through a ton of pain with protocols and such on the router to get media to transfer from my PC to it.
Saved $50, but I have some work ahead of me to get everything working perfect like that. I usually have to do a network connection test to get the router to recognize the port forwarding.
(PS: PM me if any of you other guys are nuts enough to try this and wanna know what I've done so far. It works with LIVE, at least.)