During my Ph.D. thesis, I developed this system in order to be able to present my work (about image similarity and compression) in a more fanciful way.
The basic idea was to take standard PDF files (generated e.g. with Powerpoint, OpenOffice Impress or Latex-Beamer), and render them into an OpenGL environment, allowing detailed zoom into slides (e.g., into diagrams) and displaying e.g. 3D simulations and 3D statistics during the talk without having to switch to another window.
The system is currently able to display several sets of slides, physic-engine based spring embeddding animations, texture synthesis simulations, online image segmentation and fractal decompression, and can also be coupled with a web camera. (During my Ph.D. defense, I pointed the camera into the audience and then demonstrated the new compression algorithms using the live images.)