To throw another system into the mix, I have been using TVersity on my PC to stream music/video wirelessly to my PS3. The PS3 then sends the audio to the 990. The PS3 shows the computer's folders/file names for the songs on the TV screen. You just click to the album or specific song you want to hear.

It works great for MP3 files. I'm not sure about the high quality aspect of it though.

The drawbackis that the setup did take a lot of trial & error to get my network to recognize the PS3.

Oy