Now, I'm pretty sure the dashboard above would be a bit distracting, but this company seems to have some neat and custom fitting dashboard mounts for various devices. It's a 2 part process - first you pick your device, then tell them what kind of car you have.
The mounts actually just clip into place, so you don't have to take apart your dashboard or screw anything down. They've figured out places on most makes and models where this works just by wedging their holder into the seams already in your car's dashboard. Haven't tried them myself, but just found the site and it looks pretty good.
I currently use a custom mount from a company called Arkon Resources ( http://www.arkon.com/ ) and it works great. The base of the mount actually just clips onto my air conditioning vent.
