PowToon is a free video animation tool and it's pretty awesome! It allows users to create online animated videos for presentations with easy, ready-to-use templates. Check out my sample on our Edmodo school page. Some students in the EMS3O (Media Studies) class just used it and they gave it rave reviews. This might be a good addition to your presentations and other projects. Please see the Teacher-Librarian if you have any questions.

http://www.powtoon.com/