Meograph lets you tell a story with text, photos, videos, and audio narration. Richard Byrne has written about it a couple of times, so I’d suggest you read how he describes it.
In many ways, it seems similar to Tripline, which I’ve previously posted about. Tripline seems a bit easier, though, for students and others to use, though Meograph does look impressive.
I’m adding Meograph to The Best Map-Making Sites On The Web and to The Best Ways To Create Online Slideshows.
Thanks for the plug.