Imagine your PowerPoint presentation was laid out on a large canvas with other imagery complementing it or providing the overall backdrop. Then imagine being able to zoom into and flying to parts of the canvas thus revealing your intended presentation. You could do this in sequential order or you could simply zoom out and fly to another area taking you along a different path to make an alternative point. The OfficeLabs team has given us pptPlex - adding yet more power to PowerPoint. I've been waiting for this incubation technology to go public so please go ahead and try it here: http://www.officelabs.com/projects/pptPlex/Pages/default.aspx.
P.S. My clever friend, Christoph Schittko, built something similar with DeepZoom because pptPlex wasn't public. Now he can just use this!