Create interactive timelines online for free with Dipity. This would be a great tool for revision of historical topics and it can be shared and embedded.

Ed Yong has a neat example on his NotExactlyRocketScience blog, of the timeline of reprogrammed (induced pluripotent) stem cell research:

Reprogrammed stem cells on Dipity

Why use this?

• It’s free, visual, quick and easy
• Images, links and videos can be inserted
• You can connect it with facebook for easy logins (like SlideShare)
• Sharing is easy, embeds are possible (though not WordPress.com, again)

What could it be used for?

• Book or topic reports, such as a timeline of Darwin’s life and work.
• Mapping any time-related topic. History of the Universe, anyone?

Of course, if you’re studying History, Economics or current affairs, it would be an ideal tool.