Hey I just discovered this cool timeline tool which I intend to use next year with my History classes. It is called Dipity and allows the user to create timelines over any period and to post events with multimedia embedded. There is even a function which allows for the presenting of timelines in a “flipbook” format.
This was clearly made as a free social software tool for people to share their travels with each other. I could just imagine getting students either individually or in groups to present a historical topic to the class or via their blog etc. Of course it can be embedded. Here is a sample one that I found on the History of Technology: