I tend to change my desktop wallpaper on a fairly regular basis, so when I discovered this Vista sidebar gadget that can do it for me, I was thrilled. The Desktop Wallpaper gadget is similar to the Slide Show gadget, except that it allows you to change your wallpaper in designated intervals. What's cool about it is that it allows for a couple more wallpaper options than Vista supports by default, like "crop to fit screen" and "maintain aspect ratio." You can either have the slide show feature playing or you can set that option to "preview next wallpaper" instead. The gadget's author has created other great gadgets, including the Polaroid gadget which lets you place photos on your desktop, rotate them, and give them captions. He is also working on version 2 of the Desktop gadget, which would bring video to the desktop as well, like DreamScene does.