Fundamentally, the developers involved in making the Zune usable on
linux (using libmtp) have a struck a deadend because of the way that
the Zune needs to authenticate with the computer before allowing
any(which means even legal, non-DRM mp3) files to be transferred.
libmtp is allowing listing and browsing of Zune contents, but no file
transfer is possible
(http://www.zuneboards.com/forums/zune-hacks-mods/2772-zune-linux-
progress.html for successful transfer, once you get the Zune
authenticated using VMWare)