I had already visited this site which offers lots of exercises and videos but a drawback I found was that I wasn´t able to enlarge the screen in order to use the videos in the classroom with my groups. Now, with the window media player format we CAN do that. Click on the video title you want, when the page has uploaded right-click with your mouse on the screen, choose ZOOM, whole screen and voilá you have the video to use in class. I believe you can´t download it though.
Why don´t you have a look? It´s really worth a visit.
Remember the videos can be found on the left sidebar.