Remember, unlock the Zune first if you want to sync to it in any program other than the Zune program.
Manual Unlocking:
It actually has nothing to do with manual labor (aka hardware modifications), so it does not void your warranty.
By default, the Zune can not be accessed by anything other than the
Zune program. To get it to work in other programs we have to (at this
point) manually unlock it. Here is how:
1. Start up the Zune program
2. Get media and start a sync to your Zune
3. When your Zune is displaying the "synconizing" screen, end the Zune process through Windows Task Manager
4. Fire up zAlternator and set Zune to use a different program
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Screenies: