In a nutshell, the most important thing you can do when pitching for investment is remember how investors listen.
You start to speak, and they hear something like "blah blah blah when-am-I-going-to-get-my-money-back blah blah why-should-I-believe-you?"
For Queen Mary, University of London, I did a speed session for academics who want to be entrepreneurs -- and the first stop is investors to get some seed funding.
I was given 15 minutes to sum it all up -- forgive the "ok's" and "rights" as I sped. But here is some video on how to pitch for investment. The specifics weren't filmed due to confidentiality issues with the start-ups.