Brief History of the Internet - from the Internet Society.
Community Memory - discussion list on the history of cyberspace.
Delphi's Brief History of the Internet
History of the Internet - timeline of the development of the Internet.
History of the Internet and the WWW - features the history of both internet and WWW, also has sections about html and browsers.
History of the Internet and Web - in timeline format, with emphasis on the many creators and their contributions.
History of the Internet and WorldWideWeb - list of links to the best of the web sites about Internet and WWW history and statistics.
Hobbes' Internet Timeline - starting in 1950, tracing the events that lead to the Internet of today.
International Internet Day - on October 1st, 1999 the Internet turns thirty. Directory of celebrations around the globe, and a giant online birthday card.
Internet - History - very brief overview.
Internet Archive - building a digital library for the future.
Internet Historical Society - where long-time netizens can post short essays about how things were on the net in the "old days."
Internet History & WWW Links - gives a brief history of the Internet with links to original sources.
Keith Lynch's timeline of net related terms and concepts
LivingInternet.com - source of information about the Internet covering the history of email, usenet, IRC, MUDs, mailing lists, the Web, and more.
MIT Sloan's Digital Time Capsule - contains digitized representations of the people, places, products, events, trends, and news shaping business and the Internet in early 1999. The capsule was sealed on February 4, 1999 and will be reopened in 2004.
MUDdex - the history of MUDs.
Nerds 2.0.1: A Brief History of the Internet
Net Hype - a brief history of the Net.
NetHistory - A page dedicated to the preservation of Internet and BITNET history. Lots of online magazines, documentation, stories.
Netizens: On the History and Impact of Usenet and the Internet
RFC 2555 - commemorating and recollecting 30 years of RFCs, as a tribute to the late Jon Postel, RFC archivist.
Roads and Crossroads of Internet's History
Timeline - from the PBS series Life on the Internet.