So I've been digging around the net trying to find a good set of alternatives to Powerpoint. Part of my interest is that I found one, Prezi, that I liked for it's free-form style. Part of the power of it was that I can zoom out and select any part of the presentation to continue from and it feels much like a mind map or association of thoughts.

Are there any other tools that offer anything similar in vein to this way of presenting material? I'm looking for something that just pops differently than a death-by-powerpoint-style presentation, so I would be happy to find tools that help present information in more fluid styles.

It doesn't have to mirror Prezi, and I wouldn't want that, but after seeing what Prezi does, I have to think there are other ways of presenting information to a group of people than one square slide at a time.