The following animation is a concise, high-level technical history of the Internet, c. 1957-2009. This ~8 minute animation covers its early development and concepts, including the creation of the commercial, military, and scientific networks.
This history describes how the politics of the times, such as the Cold War, influenced the decentralized, distributed design and development of the ‘Net. It also details the non-USA contributions to its development.
I enjoyed watching the development of the network protocols themselves. The visual presentation is clean, flows well, and conveys a great deal of information. More information about the history and development of the Internet is available at Hobbes’ Internet Timeline.