2.5d camera control script

I have no problem making a standard sidescroller control script: Just set camera x and y to the same as the character's. However, I would like some damping. If the character is going quickly, the camera should slide back and rotate around so it is more following the character. Like dropship on iPod: http://www.youtube.com/watch?v=48cu2kVLEnc is a good example on what I mean. Any ideas on how to implement this?