Some weeks ago Robin 'Roblimo' Miller, was invited in Microsoft Campus and was given Zune as a gift. But he decided not to keep it and give it to someone who could install Linux on it, or use it with Linux. And the winner is: Richard Low of the libmtp and XNJB projects...

From linux.com :

[...] in the end sanity prevailed because several Linux.com readers, including Kostas Tzounopoulos of Zune-Online.com, told us that the libmtp project was already working to produce Linux and Mac support for the protocol that runs the Zune, and suggested that Richard Low of libmtp would be the perfect recipient.
 
Before long, Richard emailed us himself to say he'd be willing to take on the project, and since he was the only potential recipient who had other people actively lobbying on his behalf, not to mention that he and his libmtp cohorts have already laid some groundwork for Zune multi-OS compatibility, he seemed like the person to whom it ought to go.
 
So congrats, Richard. I'll get your mailing/shipping address via private email and, as mentioned in the original article, I'll send the Zune to you from my Florida home office as soon as the annual after-Christmas package-return frenzy dies down. If, after you are done with it, you pass it on to someone who wants to try to port Linux to it -- as you said in your email that you might do -- that's fine with me. Once I send it to you, it's yours. 

links: article on linux.com | Zune on Mac and Linux | libmtp project | XNJB project