The flashslide maker is a free tool http://www.flash-slideshow-maker.com/
"You can easily make a dynamic photo gallery for your website, blog, and CD's. It is user friendly and lots of fun."
Free download - Windows only. There is a paid version if you do not want the link back to the site, but the link is tasteful and does not take away from the slide show. There are many templates in which you can choose a unique look. Timing can be controlled; music added. All in all, a nice tool.
See an example here; you may need to click the stop icon to read the words.