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I could be wrong but I'm almost certain nobody has wrote a C# XML parser for Unity yet (because we have System.Xml). I have to agree with you...
Yup, that's the name of the script. All you'll want in it are functions to be called from other classes such as an AI class to play animations....
To make the player a child of the car: playerObject.transform.parent = carObject.transform
Yes, the standard approach to animating in Unity is to have a single script that handles the animation. You can look at this tutorial's animation...
I'm pretty sure hit.gameObject.renderer.material will get the material (yeah it's fairly nested). hit.gameObject.renderer will return null if...
I think what you're looking for is the Hashtable class: http://unity3d.com/support/documentation/ScriptReference/Hashtable.html