Prezi is a unique presetation tool--it allows you to move around the page and highlight different areas of your screen. The basic prezi tool is free to the public, but if you use it a lot, you might want to look at the subscription version with more bells and whistles.
The free version would be great to share with your students for a project--book chats, biographical information, country facts....anything that might go to a powerpoint can go on a Prezi. There's even information on the Prezi page about "Prezifying your Powerpoint."
So you can see what I'm talking about, here's a great example of a Prezi put together by a friend of mine. She was asked to give a presentation about her library and the digital tools available. Take a look and see if you agree with me--this presentation has a professional look and feel to it and it's way more fun than sitting through another "death by powerpoint" type of presentation!