I spent an hour this morning hacking together a quick prototype that brought together Windows Azure hosting and storage, the Bing Maps SDK, and a set of photos that Amy and I have been collecting of US Post Offices. The result is a United States Post Offices mashup which shows a map with pushpins for each post office for which which we have a photo.
The practical part of this was really the experience rather than the output. In short, it was really surprisingly easy to pull together the pieces to make this work. It takes a little while to get Visual Studio set up as an Azure development platform but once that's done (once) it's trivial taking existing techniques and having them run cloud-enabled with barely any changes.
A few resources that came in handy: