This one may be fun for those out there who like editing video. Apple has been awarded a patent for synchronizing audio and video in what is described in the patent application as the following:
Some embodiments of the invention provide a method for synchronizing an audio stream with a video stream. This method involves searching in the audio stream for audio data having values that match a distinct set of audio data values and synchronizing the audio stream with the video stream based on the search. In some embodiments, the distinct set of audio data values is defined by a predetermined distinct tone. In other embodiments, the distinct set of audio data values is defined by audio data contained in the video stream.
It seems like something that would be used with Final Cut or iMovie. We're not video editors, but it may be something that users of those software programs may find useful…that is, if it's not something that's already being used.