I use my macbook to connect my xbox360 to live. I use an ethernet cable to connect to my xbox360 to my macbook. Then the macbook connects to my WRT56G wireless router and I'm on live, this worked perfectly. I didn't have to buy the Microsoft USB adapter. I haven't tried this setup with my new AEBS yet; I'm sure it will work fine.
TV and stream everything. I bought it off ebay for $45 shipped with the high gain antennas after a lightning strike at our house took it out. Couldn't be happier.