I found this fascinating quote today:
The Digital Media Player again. With the new Microsoft Zune you can wirelessly share selected full-length sample tracks, playlists, pictures or your home-grown tracks directly from Zune to Zune. Listen to receive full-length songs up to three times in three days with the option to flag that you would easily buy the next time you sync up. Browse the Zune Marketplace for access to millions of songs, old and new.Admin, Zune 30 GB Digital Media Player, May 2009
You should read the whole article.