Arkon makes a quality, versatile all-in-one product kit that allows mounting in the vents or via suction device on either the dash or windshield. I own two for use with a Touch, and they work well in both a casual (auto) as well as industrial (Semi Tractor-Trailer) application with a minimum of installation hassle.
The way the device holding arms are designed allows you to easily insert the mini usb, access reset, adjust volume and hit the on/off switch while your phone is held in the well padded cradle. The extension arm itself allows for a wide range of adjustments to suit the individual user's applications, and all the adjustment points hold their set position well under some pretty rugged (Northern Illinois/Southern Wisconsin) road conditions. Yes, the extension arm is quite susceptible to vibration, but even in the Semi on the worst of roads the device has never worked free of set adjustments with the Touch on board, or thrown the phone from the cradle.
I assure you I have no stake in Arkon. For what it is worth, I am simply an "industrial" user who puts these kind of devices through some pretty tough challenges day after day, and the simple to install and easy to use mounts these guys make has cleared the "gorilla" test with flying colors.
http://www.arkon.com/