rently, Williams only had time to add support for one specific ethernet card, the SMC8416T. You'll have to hunt around to find one.
What you need is a wireless bridge. Logitech used to make one called the "Play Link", which was marketed for ne... 's no longer made. I was fortunate enough to pick one up when they were on clearance at geeks.com for $9.99 (wish I'd bought more than one!) You see used ones pop up on eBay fairly often.
