History of the Internet and Web
Anthony Anderberg gives a timeline of communications and the Internet from 700BC to 1999, with references.
Hobbes' Internet Timeline
Robert H. Zakon highlights key events and technologies that helped shape the Internet.
Lawrence G. Roberts gives a list of events up to 1999.
The History of the Internet
Dave Kristula's chronology of the development of the Internet from the early days of ArpaNet.