Each subfolder becomes an album with its own soundtrack (if you like). But if ou prefers you can get photos from Picasa and Flick
I develop only the plugin ant that is free but you have to buy SlideShowPro to remove Green S
Video support will be avaiable asap
One last note - this plugin is quite customizeable from Plugin Manager, with more options promised for the future.
if you like to improve some slideshow option tell me
I emailed the developer a question and he replied quickly.
Install note: After installing the plugin, replace the SWF file in /plugins/content/BonckoSlideShow with the one that comes with the SlideShowProStandalone version.