Sometime you see a demo or hear an idea that seems hokay or crazy but catches your fancy because it gives you a glimpse of future possibilities. This happened to me while watching a demo from a japanese company called tonchidot at the techcrunch50 conference. They claimed to develop a technology that lets you tag the realworld using your camera phone. Now that is a great idea, but I was sceptical because they only showed a video. Now they came out with an iphone app that lets you do that using an iphone. This is an interesting compnay to watch.
This may seem like science fiction but we are not that far off. NYT has an interesting article about mobile enhanced navigation of the real world.