I am new here and I would like to share the solution i make which i posted on youtube.
[ame=http://www.youtube.com/watch?v=s3kRdYG9IXo]YouTube - DIY iPad Car Mount[/ame]
This is my car mount solution and the video shows you how I managed to use a string to hold the iPad on my car dashboard. This solution should be able to be applied to most cars unless your car has special designed dashboard. It holds the iPad very firm and allows you to remove the iPad easily.
Any suggestion to improve and comments are welcome.