The most recent installment of the Zune newsletter includes a survey question that hints at the possibility of the Zune being used as additional Xbox 360 storage. After selecting "Yes" to the first question, readers are asked "Have you ever connected your Zune to your Xbox to do any of the following?" The first response to the question is "Use my Zune hard drive for extra Xbox 360 storage." One could interpret this as meaning that Microsoft is considering making the Zune official backup storage for saved games, Marketplace downloads, etc.
Yes, that would be a great reason to buy a Zune, but keep in mind that the question could refer to using the Zune simply as a means to upload pictures and audio tracks to the 360 (although that would be ridiculous because nobody would give a damn). And, of course, it may mean nothing at all. We shall have to wait and see if Microsoft does the smart thing here. [Zune Survey via Xbox 360 Fanboy]