Stardock DeskScapes is a program that allows users to have animated wallpaper on their Windows Vista desktop. It supports playing video as animated wallpaper, dynamically generated content as animated wallpaper, and more.
DeskScapes supports the new .Dream format. The .Dream format has been specifically designed to contain content intended to be used as animated wallpaper (making it much easier to find on the net than looking for video files). The .Dream format supports triggers, dynamic content, MPEG video, WMV video, and author information.