Prezi Adds Live Collaboration to its Presentations
Prezi lets you build a multidimensional PowerPoint all on one slide so that you merely need to move the screen up, down, left, right, etc. Here is an example of the seven wonders of the ancient world. Here is a great way to have students present geography with pictures, maps, etc. The presentation has pictures, video, graphics, links and even a worksheet all on one slide. Above is a video describing how you can create a Prezi PowerPoint with other people on other computers anywhere in the world at the same time - much as you can do with Google Docs.