well another option is a ethernet bridge its a box that plugs into the ethernet port of the 360 and the wireless router will detect it. Linksys made one and Pelican who makes a lot of 3rd party devices for the 360 and other consoles makes one. both can be found between 40-50 bucks in stores. you can also try the 'Bay. I have the one made for the 360 by Micro$oft but i got it on ebay with a 200 MS points card (good for non free downloads) for like 60 bucks shipped priority
. I was NOT about to pay 89-99 for the darn thing but it DOES work good, but it helps that my router is only like 20-30 feet from the 360
.