Wallpaper Slideshow Pro

From gPhotoShow:

Wallpaper Slideshow Pro is a utility for displaying your favorite images as your desktop wallpaper. Wallpaper Slideshow offers you complete control on your wallpapers collection. It has lots of options that allows you customize the way wallpapers are created, for example for each image you can decide whether it must be automatically resized to fit the screen, centered, tiled or spanned across your multiple monitors. It is also possible to overlay a calendar, text, or info taken from exit,iptc, or xmp fields on your wallpapers. New wallpaper can be set on windows startup, at regular intervals or manually when you press a hotkey or double click on its icon. Wallpaper Slideshow is simple to use, intuitive and complete with full context-sensitive help.