To determine the direction that your character is facing, try [Transform.forward][1].
To rotate an object based on the position of another gameObject, try [Transform.LookAt][2] like so:
Transform.LookAt(crosshairGO.transform.position);
Did that help? I'm not sure if that's what you wanted.
Klep
[1]: http://unity3d.com/support/documentation/ScriptReference/Transform-forward.html
[2]: http://unity3d.com/support/documentation/ScriptReference/Transform.LookAt.html
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