Wanted: Service to speed up video playback

I would love a service that sped up playback of web video. Like infinitelooper.com it would take a URI from a video hosting service, but instead of infinitely looping this service’s trick would be to increase playback speed, without altering audio pitch. Tis would be useful for quickly digesting conference videos, like RSA Animate video, but of course without the animation, and automated.