If you skip to the last 30 seconds of the first SIX MINUTE video tutorial, you can see the app in action.  Otherwise, you have to sit through a whole class on how to use the app before you even know if you want to use it.<p>Little lesson in creating a good video demo....<p>Get to the point.<p>Then provide more videos for details.<p>(I guess you could say this should be expected from an MIT project website)