I like to use Prezi more than PowerPoint to make presentations because I think in flow charts and Prezi is more intuitive for me. I have been playing around with Webspiration, and I think it could be a good planning tool for students who think in flows. From my early trials Webspiration is pretty much a mind mapping tool. What is nice about it is that it allos you to share your map with others and work collaboratively on it, thus allowing a group of students to chart a project before embarking on it. It should also serve as a good template from which to start putting data into a Prezi, giving you a picture of the whole before starting to create a Prezi. Try Webspiration, http://www.mywebspiration.com/, and see if you think I am right about using it before Prezi. Also see the sugya I started to chart on Webspiration http://www.webspirationclassroom.com/launch.php.