Have you heard of the free Blabberize.com? They call themselves the talking picture; what you do is to upload a picture for editing, select a soundtrack to go with the photo, specifiy the mouth region to animate it, and convert it into video. I personally haven’t tried it, but Chris Pirillo did, by transforming Darth Vader the Phantom Menace to Darth Vader the Phantom of the Opera.
If you have too much time on your hands, you may want to try it, too.
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