writes "Apparently Apple filed for a patent for "Presentation of audible media in accommodation with external sound". With this system you would be able to hear external sounds while wearing your iPod earbuds but it also offers this tidbit. "...stored external sound can be presented with a full range of media playback features (e.g., forward, backward, pause, replay)". All the parts already exist someone just needs to make it easy to tivo (verb) your day. humm..."