"The most awesome 450 page presentation ever." That's how the authors call this slide show—and I agree. It is awesome. But knowing that it was made using only Google Docs and no extra software whatsoever, makes it truly unbelievable.
You can see part of the creation process—which took three days by three animators—in the complete YouTube Video. If you are really curious, you can access—and playback—the gigantic Google Doc that was submitted to Google's Demo Slam.