Very cool idea; I can maybe help as choosing to do a lot of speaking engagements (and then actually having the guts to do them) has helped my inner game immensely. Nothing like getting up in front of a hundred people for an hour to get rid of social anxiety
So, as far as tips, I've found the type of speaking you do and how you develop a presentation depends entirely on your audience and the purpose of the talk. So for example, a presentation in a business setting will be more straightforward--the quicker you get the facts out the better. On the contrary, something like a conference or other setting will be more relaxed and give you the opportunity to use humor, stories, etc--more entertainment. That said, I always joke around in normal life so when I speak it's no different, business or not.
The biggest things I've learned are these: if you want people to remember something, relate it back to something they know or a really great funny story. Second, if you are working with Powerpoint slides, less words and more pictures is ALWAYS better--I don't memorize my talks at all, I just use a key word or two on a slide with an awesome pic to remind me of the next thing I wanted to discuss, and then I wing it. And three, only "memorize" the first lines, how you are going to begin, and let the rest come naturally. And yes, animated body language, facial expressions, and variations in tone are helpful in keeping your audience engaged (wearing something attractive helps too
).HTH
--L