Mural as their slogan says, is a whiteboard on steroids. This web 2.0 tool is free to use for education use, but you will need to apply for access. Mural is like a giant pinboard that grows with the digital content you add to it. Yo can drag and drop files, photos and video and collaborate with others. A really cool feature is the ability to create a presentation of your content by marquee selecting the content you want on each page. Please find below a video demonstration.
Mural for Education