I've been so intrigued with this next site that I've spent more time exploring all the different timelines rather that creating one myself.
allows one to explore, create, share, and discuss a timeline about all sorts of topics from people to places to things to events. The timelines are very flexible to use. Here is a sample timeline by the creators of xtimelines which shows the variety of resources that can be used in a timeline including text, pictures and photos, links, video, and music.
I tried to embed the timeline here, but there isn't enough room to show the entire screen and it was slow.
This resource would be a very useful, visual tool for the classroom. Teachers/students could use the information in timelines for learning in a multitude of ways such as: teachers could use/create a timeline to give a brief overview of a topic; students could research a timeline in order to verify that the information is correct and up-to-date and then rate, comment, or discuss; or students could create their own timelines for class projects. I really enjoyed my exploration and I think I'll see if I can create a timeline myself.
For a really good explanation read Joyce Valenza's post about xtimelines here. She did a great job on the list of higher level thinking that can be achieved using xtimelines.