If you want to go with PowerPoint watch this first...
http://vids.myspace.com/index.cfm?fu...d=15296 37984
Secondly, I'm against all technology unless absolutly needed in a Chairmans interview. They KNOW the information, they have it infront of them printed out about all your projects you're going to go over again in the distracting PowerPoint/Keynote/whatever presentation. What they want to see is the students, mentors, and their interactions, personalities, traits, and passion.
My one friend interviewed for a job as a EMT on campus at UD, and he failed his first interview. Why? He focused on facts and the job, not himself. They wanted someone they can be friends with, not a resume. Same with Chairmans, they don't want to give the award to a list of FLL and FTC teams and community service hours. They want to give the award to the students, mentors, teachers, and parents who put their heart and passion into what they do and what results (or as important, if not more so, lac of results) they got.
Sell your drive head, sell that guy in the stands who's taking scouting information, sell the guy tightening bolts, sell yourself. That's the poin of the interview, to see the humans behind the essay, not to see a PowerPoint get in the way.