Guy Kawasaki makes some good points about PowerPoint presentations, saying they should follow the 10/20/30 Rule:  have 10 slides, be no longer than 20 minutes and contain font no smaller than 30 points. 

He suggests that whatever the presentation, it just needs to follow this format:

1. Problem
2. Your solution
3. Business model
4. Underlying magic/technology
5. Marketing and sales
6. Competition
7. Team
8. Projections and milestones
9. Status and timeline
10. Summary and call to action