There's been some talk in the Windows Phone 7 forums of the possibility of a Photosynth app for Windows Phone (it's based on silverlight) and I think that is an awesome idea.
We take a few snaps on our phone's camera and can upload them straight to our Photosynth accounts (just like we can with Facebook) and then we can create a new synth. We could also view our current synths.
The new Windows phone could pull this off amazingly, but we could also have a Windows Mobile app. It could integrate into, for example, HTC Sense (or even just as a stand alone app) and we could again upload images into a new synth straight from our phones.