Oh, and another tip should you use a PowerPoint: Keep everything so fresh and so clean clean. Just as a five-motor, overly-complex arm will fail miserably on the field, too many good presentations have gone in the toilet because of painful abuses of the software.
By the way, I found this article the other day--it might be of use to you:
How to Wow 'Em Like Steve Jobs
(Good luck in developing your Reality Distortion Field. 
)