If you have ever played (or watched) the game Half-Life 2, you will be familiar with state of the art urban modeling, physical models in an interactive context etc. Now have a look at some of the images from Google Earth, which includes data describing the shape of buildings, mix in some of Microsoft's Virtual Earth, which has high resolution data of buildings taken from a 45 degree angle and imagine the possibilities (taking a good does of geocoded data, GPS, RFID and so on).
You search for a hotel, a map tells you it is in striking distance of your business meeting or conference, so you flip your rich client in to walk-around mode and walk around the neighbourhood. It turns out there are just too many broken windows, and what is more, the pool of the hotel is constantly in the shadow of surrounding buildings. So you explore - just walking the streets, guided by your local search which tells you which way to head for other hotels. Finally, you find one you like. You walk up to the door and interact with an online receptionist to book your stay.