I used this to stream music from my main PC to my living room and play the music over my receiver via the optical cable. Worked great, but now I am building a HTPC so I need to recoup some money. I'm including the needed optical cable so that you can connect directly to your receiver's optical input should you buy it for wireless music streaming on your network.
This can also be used as a router in your home. This is wireless g format.
Specs can be found here:
Asking $80 shipped.