To get an intuitive understanding of the Stokes theorem, I recommand the [book by Arnol'd on mechanics][1]. It gives a very intuitive definition of the exterior derivative in such a way that the Stokes theorem becomes, heuristically, very easy to grasp.

I also find [Analysis, manifolds and physics][2]  and [Geometry, topology and physics][3] to be two great source of inspiration to understand the intertwining between geometry and physics. The first is written by mathematicians, the second by a physicist.




  [1]: http://books.google.com/books?id=Pd8-s6rOt_cC
  [2]: http://books.google.com/books?id=hUWEXphqLo8C
  [3]: http://books.google.com/books?id=cH-XQB0Ex5wC