I know that most of us here dont know what im talking about so ill try to explain it clearly.

in OSX for the mac there is an option where you can put pictures or wallpapers in a folder and the OS will randomly pick pictures out and post them as wallpaper at preset times or system events. While changing wallpapers it gracefully fades in and out to each one. Also, because it uses OpenGL to do it (I think) there is no noticeable speed hit while doing it. I've seen macs play dvds while the background is steadily changing without any problems.

Now, the question. is there anything out there that is similar for windows? Only thing I've seen thats close is Dremples, but thats an equiv to a lava lamp, and not pictures.