Guy Kawasaki has an article by Bill Reichert:
The purpose of your pitch is to sell, not to teach. Your job is to excite, not to educate.
Pitching is about understanding what your customer (the investor) is most interested in, and developing a dialog that enables you to connect with the head, the heart, and the gut of the investor. If you want advice about pitching, you can ask a venture capitalist, but you probably wont get a very good answer. Most VCs are analytic types, and so they will give you a laundry list of topics you should cover. They wont tell you what really floats their boat, mainly because they cant articulate it in useful terms. I know it when I see it, is about the best answer youll get.