I remember watching Harry Potter and seeing how pictures in frames were animated and thinking "Wow, this is cool!"
For years, many people have wanted to have animated wallpapers. And for years, developers would try to put something together but inevitably, the results were not acceptable for the target audience.
But now, with Windows Vista Ultimate, things have changed. Now you can have animated wallpapers that on a modern, high end machine use very little CPU.
Having a good engine to run animated wallppaers, is only half the story of course. You also need to have animated wallpapers that people would actually want to use. After all, if they're distracting or obnoxious, people won't use them.
For many months now, we've been working with Microsoft on a project to create and provide animated wallpapers to users of Windows Vista Ultimate.
We'll have more details soon.