Duuuude, check this out!

-WhatIsAPrezi?
 Prezi is a web-based presentation tool using a map layout and zooming to show contextual relationships which addresses some of the shortcomings of Microsoft PowerPoint.
-HowIsItDifferentFromAPowerPoint?
I think you should remember that these are very different tools, and they have different pros and cons. Prezi: during a presentation, it’s not going to be that different to powerpoint.
Powerpoint: probably more flexible, you can do a lot more with it. 
It is probably fair to say that Prezi is better visually, while PowerPoint does a good job on written content, but you could create a visual PowerPoint and a texty Prezi.
-ThreeFactsForFirstTimeUsers...
1. Create your structure first, fill in the details afterwards.
2. Use PDFs, not JPEGs – and remember every image will fill the screen.
3. Make sure you are the dog, and Prezi is the tail!!!