Here are three presentation tools illustrating the same overview of some of the tools I have used with my students for various projects. Sliderocket allows users to quickly convert PowerPoint presentation into a format that can be shared online.
Prezi allows a non-linear presentation style which is both refreshing and frustrating to work with!
Slideshare is another tool that converts PowerPoint presentations into online slideshows. It is not quite as fast as Sliderocket and you cannot edit the slideshow directly online, but you can replace your original ppt while conserving the links.
