I got to try out the Droid navigation app today on a 160 mile round trip in the Atlanta area. I bought the car mount and multimedia station with my Droid. The navigation app worked really well and the traffic layer seemed to be pretty accurate. It took me a while to figure out that I had to hit "my location" after the route was displayed to get it going. I have a TomTom GPS also, so I had dueling GPS's going. I also have a Delorme GPS receiver for my laptop that works better than anything else I have ever used.