We've seen quite a few next-gen nav device concepts, but none with as much potential as the Virtual Cable, from a New Jersey company called Making Virtual Solid. The system uses a laser, a set of lenses, and a moving mirror mounted in the dashboard to project a 3D route-guidance line above the road ahead, as though it's actually out in front of the driver. Besides making driving that much more like a video game, the company says mass-produced versions will cost somewhere around $400 as a factory-installed option, and can be easily interfaced with existing GPS systems. Sadly, there don't appear to be any live videos of the system in action, but judging from the number of patent applications and incredibly detailed schematics and explanations on the website, the vapor factor seems pretty low. Check the read link for a set of video mockups of the system in action.