I’m not aware of anything like this already written, but I just wrote this exact functionality into a theme. Contact me via my profile page if you’d like to work something out.
well I can build plugin like this..
let me know if you are interested…
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My new wordpress plugin will do that functionality. If you are not in a hurry, you can wait until Envato launches the new competition. (It’s ready just waiting for the competition to begin)