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Did you know that you can make slide show movies with Picasa? Picasa is not a movie making program, so if you really get into this type of thing, you would be better off purchasing a program. If all you want is a short slide show movie with some music in the background, Picasa can do that for you.
First select the pictures you want to use in your movie and then click on Create in the top menu.Scroll down and click on movie.
If you want to add music, click load in the top left corner and find your song. Then you can adjust if you want to fit your pictures into the music or not.