If you have PowerPoint 2007, try to find an experimental plugin call pptplex. It allows you to create a presentation almost identical to the style you described

If you have PowerPoint 2007, try to find an experimental plugin call pptplex. It allows you to create a presentation almost identical to the style you described, with an almost infinite zoom feature. It came out of the Microsoft research labs, where there mixed the technology behind Seadragon (now deep zoom - theres a great talk on TED with one of the creators of Seadragon)