Moving away from PowerPoint?

After reading The Back of the Napkin I'm giving serious thought to moving away from slick PowerPoint (and my actual preference, Keynote) presentations and moving toward real-time diagramming of my ideas on a white board, flip chart, or piece of paper. I just did an experimental film using simple hand-drawn pictures on a series of index cards and laying them in a rough prototype of a proposed workflow for a client and it seemed to have worked just as well, if not better, than trying to do the same thing in a more polished, "professional" way. I'll keep experimenting with this notion. But I'm more inclined to move toward this intuition of mine based upon this great blog post. I love this representative quote:

[Speaking about others showing up with portfolios of their past work and him showing up with a paintbrush...]

It not about the past; it’s about the future. It’s not “build me something like you’ve already done” but “build me something from your imagination.” Calatrava came with a paintbrush and a vision, not a PowerPoint of his projects.

The challenge isn’t putting together the slickest presentation. The challenge is having the imagination and the ability to converse with clients about what their future will be. Those are the paintings that will win commissions.