I’ve mentioned the Prezi system for alternative presentations before, and a few people are starting to use them too. Instead of creating ‘slides’ you work on a large canvas and make you ‘map’ of the elements and how you navigate around them. One huge advantage is that you don’t have to stick to the linear “here-then-there” presentation method, you can jump around the scene as your audience asks questions.
Here’s one I did about my iPhone; less about the content and more about what you can do in this environment. I’m forever learning, and making this was fun!