"MicroLink has released a Low/High-tech streaming audio solution of sorts based on HomePlug technology called the MicroLink dLAN Audio (via TRFJ). Each dLAN adapter features audio input/output sockets that let you wire it to any RCA equipped audio device. In addition, each adapter has the ability to output audio from four separate channels using a Windows Media Player or Winamp plugin provided by the company."
This looks like a pretty good solution for getting speakers into out of the way places. I know this would have been much easier than crawling through my attic to run my rear channel speakers and speakers to my patio.