This is Simpleviewer, a Flash based photoviewer. This version (which is branded in the bottom rh corner) is free, but you have minimal control over the way it works and looks. You can buy the source and twiddle away to your hearts content if you wish.

The pictures are not part of the Flash swf object. The swf reads an XML file and loads the pictures when required. Because of this it's easy to change the content of the slide show.

One problem with using Flash (apart from the fact that it won't work on an iPad), is that it somehow or other it puts itself right at the top of the z-order, so things like drop down menus get hidden behind.
The look and layout of the site are provided by a template made using Artisteer. CSS to the max !