Droppics Slideshow theme
Droppics got 2 slideshow themes. A quick slideshow (this one) to make slideshow in a breeze and an advanced one to add content over images. With this slideshow you just have to drop images, click on the theme and you got the result bellow. Of course you can make all your galleries looks like a slideshow and each gallery have it's own parameters.
Here's the Slideshow theme demo, live.