How would you feel about having a screenshot and replay feature (not too disimilar to Halo: Reach) built into the Xbox 360 dashboard? Where no matter what game application you're running you can save screenshots and videos to the Xbox Live cloud and access them later to share with your friends on xbox.com, Facebook, or other forums (alot like Steam offers).
I can think of a few good uses of such features, and am honestly surprised they haven't, or one or the other, been made available as of yet.
With the upcoming release of Youtube, and Bing, along with the cloud being integrated into XBox Live, the reality of such features being possible is now even more likely. So, would you want it? Would you use it? Do you have any other ideas related to the specfic ideas that you feel would go great alongside them?