Roger from empeg has been working on this in his spare time, but nothing has come of it yet, and nothing may ever come of it as Roger has indicated in other threads. On the Linux side, Mark Lord did release a tool about a year ago to sync music, but it's somewhat limited in features. (Looks like he just made it to suit his particular setup when he made it a year or so ago).

Empeg does have a full source code release of emptool, the tool used to talk to the empeg under Linux. Looking at that might be the best start to a Windows based sync tool.