Microsoft’s Zune Device Diagnostic Tool is now available. The Zune Device Diagnostic Tool compiles data to help Product Support Services diagnose Zune USB and wireless sync connection problems.
While you’re troubleshooting your Zune, go ahead and upgrade to the most recent version of the Zune client software, version 2.1 as of today [12-24-2007].
Supported OSs for both the client and diagnostic software are Windows XP SP2+ and Windows Vista.
Lastly, check out this post on forums.zune.net that discusses resolutions to many Zune sync problems.
I sure hope Santa Claus brings a nice 80GB Zune to our household!