Not much is documented on the switches available in Windows Zune. However here is what I used for a silent installation.
ZunePackage.exe /qn /accepteula
Some more information can be found on a TechNet blog... http://blogs.technet.com/b/configurationmgr/archive/2011/08/18/how-to-deploy-the-zune-desktop-client-using-microsoft-system-center-configuration-manager-2007.aspx
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