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.

Internet Chronology
Lawrence G. Roberts gives a list of events up to 1999.

Keith Lynch's Timeline of Net Related Terms and Concepts
Chronology details when certain terms, concepts, stories, and people were first mentioned online.

Poynter: New Media Timeline
David Shedden looks at the history of new media journalism and the Internet.

The History of the Internet
Dave Kristula's chronology of the development of the Internet from the early days of ArpaNet.