You can not use a wirless usb device but you can use a wirless ethernet bridge.

I have mine set up for intenet radio and streaming flac files from my computer all over my wirless network.

I use this device:
http://www.amazon.com/Linksys-WGA54G-Wireless-G-Gaming-Adapter/dp/B00009X6DT

It is a solid connection- even have used it for firmware upgrades.

The only downside to this gaming adapter is it does not support WPA securty so I am using WEP which is less secure.

I have not done it yet but I can go into my linksys router and set it up so that only devices with a certain MAC address can connect. I could enter the MAC address of my denon and my xbox 360 (those are the only 2 things I use over my WiFi) and that would probably make things even more secure.

You could probably use this too:
http://www.amazon.com/Linksys-WAP54G-Wireless-G-Access-Point/dp/B00007KDVJ

I tried to set up with that one first but ran into some problems. I am sure it would work I just was not setting up something right... and at the time I found the gaming adapter for $70 while the other one was $90+

-David