I have mentioned PowToon before, but in case you missed it PowToon is a way to create short animated videos. It's a really simple way to introduce things to your students or at a presentation. Well PowToon has been generous enough to give away a free upgrade to their premium version plus accounts for all of your students. All you have to do is go to their site and either create an account or sign in with your existing account. The code to use is: ToonUp5M.
This won't last for long, so hurry up and sign up today!