For a long time of my life as a trainer, I refused to use Power Point presentations. In the trainers trainings I gave, I usually introduced the concept of death by PP early in the course. But then, slowly, PP creeped into my courses. Before, I used to spend the entire night before the start of a course to draw my flip charts. This was a meditative exercise and gave me the possibility to rehearse. But finally, I plead guilty - I do use PP more than I should, even if I try to design the individual slides as animating as possible. I include videos, images and all kind of staff. And I still use flip charts and often I joyfully press the blind button of the clicker.
Having said that, I was more than happy to watch a taped webinar: Creating Powerful Presentations with Nancy Duarte. If you are a trainer or a presenter, you got to watch this 45 minutes and I bet, your presentations will never be the same.