I just recently found out about this online tool. You can think of it like a giant, never ending piece of paper where you can zoom in and create a path for students or teachers to follow. You can embed pictures, text, audio, etc. Visit http://prezi.com/ and take a peek at the various ways you could incorporate DE Streaming videos, pictures, etc. in self created timelines, stories, etc. I think this will be a great teacher resource as it comes out of beta mode.