We have just started a new project similar to our music player, Gramola, to show our photos in a web browser, after our disappointment with existing solutions such as Piwigo or Gallery2. We hope that you’ll hear some more about it in the future.
In the meantime, while deciding about features to implement, a slideshow mode obviously came out as part of them. And we though about how cool would it be to be able to have the photo slideshow as an screensaver for your desktop.