Slide show presentations are taking the world or, at least the box office, by storm. Al Gore's global warming presentation, featured in the movie An Inconvenient Truth, is probably the most successful ever produced. Since its release, the movie has strengthened the world-wide movement to prevent global warming, won two academy awards and helped Gore win a Nobel Peace Prize in 2007.

The movie is also an example of how effective a slide show presentation can be. Presentations are a powerful way to get your message across both verbally and visually.

To help us learn how to make our slide show presentations as powerful as Al Gore's, we've asked for advice from Nancy Duarte of Duarte Design, the company behind the slide show featured in An Inconvenient Truth, and author of slide:ology: The Art and Science of Creating Great Presentations. This is what she had to say about delivering a successful presentation.