Continuing from the last post on performance coaching:
To a large extent, great presenting is like great teaching -- Ben Zander's performance at PopTech! might shed some light on other aspects of such things.
The key, I think, is that everyone remembers a favorite teacher who inspired more than any other. However, it's the passion, not the content, that people remember most. I've covered this before, but it's worth restating here:
Teach your listeners, not your content. It couldn't be truer in business than it is in school.