The video walkthrough of the new T-Mobile G1, the first Google Android phone, shows all the details you will ever need. It feels smooth and fast, although the interface looks a bit dated and mixed. It kind of reminds me of a 1990s Windows desktop manager, especially next to the glossy, ultra-polished iPhone interface. However, there are certain aspects of it that are droolworthy, like the accelerometer-based Google Maps Streetview.
Looking at streetview with an accelerometer so it matches up with the direction you are facing...?
I believe this was invented long ago... it's called "open your eyes and look around". It's like people who will go upstairs to check weatherbug to see what the temperature is outside, walking past the front door to get there. Hilarious!