Anyone knows where I can get a tried and tested good (and most importantly Free) Win7 compatible software to enable me to stream music via WiFi to my Apple Airport Express (via DTS/DD Optical SPDIF/analog)?

Is there another router brand and model that can also output audio? What I don't like about AAE is that it doesn't have Ethernet ports. Although I don't need nor use one, I'd like to have one.

Thanks