I'm a photographer and thought I'd share this insight I gained while shooting a number of speakers at a forum recently. The editor of the magazine I was shooting for specifically requested shots of people making gestures while talking - its just a more interesting picture.
So what does that mean for you if you're doing public speaking - gesture more. It attracts attention - especially if there's a photographer shooting the event. If you get more attention, you're more likely to be featured when images are chosen for publishing, both in print and on the web. Learn to wave your hands around and look excited.
The bonus of this is that when you're speaking, you're more likely to keep your audience engaged in what you're saying. How often have you stifled yawns (or not bothered to stifle them) when you've heard someone speak in a near monotone and not move at all?
It feels funny at first (I've been on the other side of the podium too) but once you get into it, you can really use it to create punctuation marks as you speak. When I started doing that, I got very receptive comments after wards about how engaging it looked.
You could practice it at the same time you're rehearsing a speech. Also note, I'm not talking about flailing around like a windmill - but use hand movements at least once in each statement, and three times would not be out of line. Especially if a motion reinforces the statement, such as sliding your hand forward when talking about something "accelerating" or making a chopping motion when talking about cuts, stopping something or ending a trend. There are lots of other motions too. Find things that fit.
Something to think about for your next speaking engagement.