Now this forum is open I can do a little self promotion :-)
In the holy ages of Wallbase I started to build a rather big collection of wallpapers and has you can see on my profile I love sexy wallpapers, but these are not showable to everyone so I needed a software to manage "wallpapers sets" with keyboard shortcuts. I also wanted a nice integration with multi-screens wallpapers.
But I didn't find anythning good enough, so I created it my self ! I present you Ultimate Monitor Wallpaper Autochanger
You can check details, user guide and of course download links on my website : [url]http://www.strangeplanet.fr/work/umwp-autochanger[/url]
And icing on the cake : it's Open Source, you can check the source and even fork it on Github [url]https://github.com/mistic100/UMWP-Autochanger[/url]
Have fun !