Windows 7 DreamScene Activator
DreamScene was a Vista Ultimate Extra utility that allowed videos and other optimized animations to be used as desktop wallpapers. While some may find this quite desirable it could be a little distracting. Perhaps that is why it is not supported by default in Windows7?
Link: Enable DreamScene in Windows 7 with DreamScene Activator | The Windows Club
offers a download which will enable DreamScene in Windows7.
Good for those who want an animated wallpaper?