When I switched the Windows Live account I was using in Zune from a US registered account to a German registered account I wondered where all the features like podcast browsing and SmartDJ disappeared to.
For some reason Microsoft thinks that if you are in Germany you might not understand how these things work if there are not in the German language ;).
To turn these features on you have to add a registry key “FeaturesOverride” in HKCU\Software\Microsoft\Zune\ and add the DWORD values as in the graphic below:
Open up Zune and the features should be there :D