[alexpetralia]

Once of my speaking tricks, which your evaluation of Gary touched upon, is "maximize variability." Vary your emotions (excited, worried), your tempo (fast, slow), your pauses (no pauses, long pauses), your eye contact, your gestures, etc. Of course it is not exact but I've found it to be a good heuristic. We are captivated by variability (things which change).

[fishtoaster]

This is something I'm still working on. Every time I prepare a talk, I record myself doing it at least once and force myself to, painfully, watch it. Invariably my feedback for myself is to add more variability. Especially in a prepared talk, I have to force myself to add much more emotion than feels natural in order for it to come out interesting-looking in the talk.