One of our members (Micah) decided to do a how-to on how to setup an audio pc, supporting multiple zones, using Winamp, Girder and X10 hardware. He did an incredible job, no other automation software is needed for this! Check it out.
http://www.cocoontech.com/index.php?showtopic=171
http://www.cocoontech.com/index.php?showtopic=171