This week's news of the Zune joining Microsoft's PC-Xbox game universe has some wonks expecting an official Zune-Xbox connectivity announcement any minute now. Given the WiFi capability, seems like it would be a fairly trivial thing to add via firmware update, but to what point?
About the only actual use I can think of for an Xbox-Zune link is a slightly more convenient way to get music on the Xbox hard drive.
Zune / xBox Wifi Connectivity In The Next 60 Days - You Heard It Here First [Zune Luv]