I released the Content Slideshow plugin on WordPress.org a few weeks ago. It’s intended for a very specific use-case, but is extremely useful if you’re looking for this type of a solution.

We use it at USC ASCE to automatically create a slideshow of all of the pictures we’ve uploaded to our blog. This is pretty useful when we’re recruiting members because we can open it on a tablet or project it and have it running in the background while we talk to prospective members.