I had learned about Prezi over the summer, but never got a chance to work with it until this week. Today I finished my first presentation. It is a presentation I am doing for a professional development session next week at my school on Google Applications and some other free things for teachers.
I found Prezi very easy to use and once I started playing with it a little, I started having fun with it. I'm going to continue to explore more features in it, including automatic timing of each part, frames, grouping, and more.
Try it out as a nice alternative to just using PowerPoint.