Prezi

I have researched Prezi at http://prezi.com/learn/. I do think that this tool would be great for upper primary and secondary school students. Lots of details can be displayed and focused upon through the moving canvas.
For example a class concept web that has been created  can then be viewed in smaller sections, discussed and research in more detail.
I did find that it made me a little sea sick as I moved around the canvas. Students would I feel enjoy the visual and moving aspects of this learning tool.
I am not too sure that I would use this tool, but it is one that maybe with a little practise would provide a great hook for students to begin a new unit of work.