A1 Automatic Wallpaper Changer is a wallpaper manager for Windows. It serves as an easier way to change your wallpaper without any need to do it manually. The main feature of this application is its timer. When the application is running, it can be configured to automatically change your wallpaper at a specified time or in intervals. By default, when you add images to the interface, A1 Automatic Wallpaper Changer rotates your images every 30 minutes. Of course, you can change this value. Another setting that can be changed is the order in which your wallpapers get rotated. You can set it to go forward through the list of images or backward, but the best way is to "randomize".
When you are not using it, the utility goes to the system tray, where it will keep working unattended, changing your wallpaper. It's better to configure A1 Automatic Wallpaper Changer to start with Windows.
Even if you don't want your wallpapers to be rotated constantly, this app provides a very easy way to preview your wallpapers on Windows XP; Windows Vista and 7 already have an integrated preview feature.
It supports JPEG, GIF, BMP, and PNG images. All wallpapers are stretched to fit the screen. There isn't an alternative to that, though.