Most of the team at Fotango (to name but a few ... James Duncan, Greg McCarroll, Mark Fowler, Tom Insam, Bruce Richardson etc) are outstanding natural speakers and have given me help and useful comments.
Many of my friends in the world of technology (Jonathan Laventhol, Greg Stein, Matt Webb, Nat Torkington, Nick Stone, Suw Charman, Jim Purbrick (aka Babbage), Artur Bergman, James Larson and others) have given me help and support in refining my ideas.
I do however have a "secret sauce", and in light of my conviction for openness I have to share this. I was very fortunate at Euro Oscon to spend an hour or two with Damian Conway, a master of the art of public speaking. The time I spent with Damian had a dramatic impact on me, how I approached the art of speaking and the information I presented.
If you ever have the chance to hear Damian speak I would recommend it wholeheartedly, he is an outstandingly gifted. If you ever get the chance to spend time with Damian, then grab it.
I owe him a great deal of thanks.