A start-up company by the name of Motion DSP has come up with a method for turning low resolution, barely viewable videos from camera phones and the like into a high quality, high resolution cinematic tour de force (or close to it). The technology, which was originally developed for military uses, attempts to "recreate" data in a video clip using the company's special algorithms, resulting in video that looks pretty darn good. The company's Web site has a couple of video samples to let your own eyes be the judge.
While it's not likely that you'll be able to walk into the local electronics store to pick up a copy of the technology quite yet, Motions DSP has indicated that is available for commercial licensing. Someone, to the Zapruder archives!