Have you ever heard of Robert Krampf's free "Experiment of the Week?" He sends out an experiment every week via an e-mail list. I have actually been getting these for 4 years. For some reason I don't use them very often - I think it has to do with the fact that I leave them on my computer rather than printing them out. It definitely isn't because they aren't good. He does a really good job of giving you interesting experiments that are easily done at home.
Well, this week Mr. Krampf sent an e-mail out stating that he is beginning to add videos of his favorite experiments to his website showing and explaining the experiment! What a great motivator for my children (and me)! The website is Robert Krampf's Science Education Company.
Go here to see all of the videos available.