Have you seen Prezi yet? It promises to revolutionize presentations. It thinks WAY outside the linear box, allowing users to create more organic presentations.
There's a definite learning curve--I was going to do one to demonstrate, but I'm struggling with paths. So I decided just to post one of the videos demonstrating the process. Very cool!
I'm actually giving a workshop at a conference on Monday, but that's probably not a good time to try using it. So I may convert one of the power points I do with the students and try that.
The site provides video tutorials, but needs a few that are more detailed (as I said, I'm struggling with the whole create a path thing). It also gives some great ideas for using Prezi creatively. Take a look!