Welcome to PreGameLobby Adrenalize!
My Linksys Wireless bride died on the 360 I have downstairs so I've been looking for alternatives as well. I've found the wireless 360 USB adapter for about $65-70, but also found the original Xbox wireless bridge for around $45-$50. Apparently it works fine with the 360 as well. I haven't picked anything up yet because I've been too busy, but figured I would pass along the info.
