Just downloaded this app and love it for making it easier to control the ipad while driving.
Some thoughts on improving -
I definately echo that toggling the map view in the cover art area would be awesome.
Also, i am not feeling the fake air vents. I see what you were going for and i like the idea but for the most of us who have ipad in dash, it looks a little off to have our real air vents and then air vents on the screen. I do LOVE the button look and gauges, definately a plus, especially since the night view perfectly matches the color of my factory gauges which is a total home run for me.
Instead of the air vents maybe you could put up like a notification window for pending emails?
I love the dashboard look of this and dont want to lose that but would love to see some other options aside from the vents. I do some freelance photoshop work so if you'd like some assistance, please feel free to reach out to me.