Their website descibes it as "Ridiculously simple storytelling".... and goes on to say: "Soundslides is a rapid production tool for still image and audio web presentations."

Having downloaded it to try it, it seems rather clunky and alien in the way that it works. The interface is neither Mac like nor Windows like.
It may be worth a try if you have a Windows PC. If you have a mac, you are better off sticking with iPhoto or iMovie for your slide shows.

It runs on OS X and Windows XP.
$39.95 (£21)
www.soundslides.com