I had a chance to play around a bit with the nav system on one of the cars at Menlo Park the other day, and I shot a brief little video. This doesn't show entering the destination, which is really a great experience. I entered the address of my office by simply typing the street number and name, and the car auto-completed several options in nearby cities, one of which was correct. I tapped that one to set the destination, and the map slid in next to the speedometer.
It's a really, really nice nav system. I look forward to trying it out on the road, to see if it provides enough warning of turns to get into the proper lane and so on. But it's certainly head and shoulders above anything else I've used in a vehicle.