Fliptrack is a great site that allows you to create FREE slideshows of your photos with special effects and a soundtrack.
You create Fliptrack Music Slideshows by picking your choice of popular music from a catalog. You then upload your photos and they are matched and synchronized to the music. The final result is like a music video or movie soundtrack. You can also add video effects and text to make the show more exciting.
The great news is that, it is perfectly legal in case you are worried. You can then share the slideshows with friends and family or with anybody on your blog, Friendster, Myspace or any other social networking site.