According to Robin Wauters blog post, "Prezi is the coolest online presentation tool I've ever seen." I think many of you will agree with Robin after you see this tool in action. If you're tired of PowerPoint and looking for new ways to present material, give Prezi a try.
If you decide to sign up, be sure to use the educational license page to get a free upgrade to the Enjoy version, or reduced price of $59/year on the Pro version (a $100/year savings).
Just keep in mind that since Prezi creates Flash files that are not accessible, these should be used in the classroom only.