Have a look at this The Guardian slideshow, which throws some light on the way the Internet started and how it developed to its present day state.
The slideshow is very comprehensive and detailed, and it allows us to choose the year we want to focus on, starting in 1969 until 2009.
There is a short comment in each of the entries, and some of them come together with videos with interviews and lots of links to delve deeply into the topic.