PC History
This site is under construction but has some nice pictures of some pre-IBM machines.
http://pc-history.org/

Charles Babbage Institute (CBI)
A research center at the University of Minnesota dedicated to promoting the study and preservation of the history of computing and information processing.
http://www.cbi.umn.edu/

Computer History Association of California
Non-profit corporation, safeguards and organizes the history of electronic computing, internationally, nationally, and in California. They collect and archive hardware, software, and documents.
http://www.chac.org/

Chronology of Personal Computers
Timeline of microcomputers from the development of the microprocessor in the 1960s through to the present day. Includes hardware, software, peripherals, companies, and individuals.
http://www.islandnet.com/~kpolsson/comphist/

Computers, Videogames and Arcade Collector's Ring
http://www.chez.com/samurai/RING/ring.htm

History of Computers
A directory of sites about the history of computers arranged categorically and with specific topic and general topic sections.
http://www.hitmill.com/computers/computerhx1.html

Triumph of the Nerds
Biographies, an interactive game, and a questions and answers forum trace the birth of the personal computer at this PBS companion site.
http://www.pbs.org/nerds/

Computer History Images
Pictures of many of the pioneering computers.
http://www.crowl.org/Lawrence/history/

Tools for Thought: The History and Future of Mind-Expanding Technology
New updated edition from MIT Press, with new interviews of historic characters.
http://mitpress.mit.edu/catalog/item/default.asp?ttype=2&tid=3784

The History of Computing Project
Offers a detailed timeline on the history of computer. Sections include hardware, software, pioneers and references.
http://www.thocp.net

Museum of the USSR Computers History
A virtual museum containing historical information on computers and computer facilities in the USSR. Includes descriptions of computers, their characteristics, pictures, and personalities.
http://www.bashedu.ru/konkurs/tarhov/english/index_e.htm

The History of Computing Science: From the Past to the Present
Lecture presented by Michelle A. Hoyle explaining how computers and computing science arose from using sticks with notches for counting, to the massive explosion of personal computers in the 1980s.
http://lecture.eingang.org/

Punched Cards
Covers the earliest ways of encoding data up to the cards used in voting systems today.
http://www.cs.uiowa.edu/~jones/cards/index.html

The Obsolete Technology Website
Pictures, documents, and advertisements of classic computers from the 1970's and 1980's.
http://oldcomputers.net

Jargon File Resources
The Jargon File (AKA, _The New Hacker's Dictionary_) is an essential repository of computer historical information.
http://catb.org/~esr/jargon/

The History of Computing
Detailed information including early pioneers and companies, archives, languages, and networking from the Department of Computer Science at Virginia Tech.
http://ei.cs.vt.edu/~history/

Reflections of a ModemJunkie
Writings on computers, the early online world, and the Internet, dating from 1992 to 2000.
http://www.lgrossman.com/mjnk/

Tools For Thought
by Howard Rheingold. Online copy of well known 1985 book on the invention of computing; includes Babbage, Turing, von Neumann, Engelbart, PARC, Kay, and Atari.
http://www.rheingold.com/texts/tft/

Computer History Museum
Focuses exclusively on the history of computing. Located in Mountain View, California. Search the collection, illustrated timeline, online exhibits and select images from the collection, "This Day in History," curator's choice, and the Hall of Fellows (awards for contributions to computing).
http://computerhistory.org

The Modern History of Computing
Historical survey from Babbage onward; by B. Jack Copeland from the Stanford Encyclopedia of Philosophy.
http://plato.stanford.edu/entries/computing-history/

Computer History
Articles and photos on many topics; user submitted content with Wiki-style editing for registered users; photo gallery, forum, feedback.
http://www.computernostalgia.net/

Silicon Valley to Internet Valley
In San Francisco Bay Area; background, history, future: trends, forecasts.
http://netvalley.com/introduction.html

The Association for History and Computing
An international organization which aims to promote and develop interest in the use of computers in all types of historical study at every level, in both teaching and research.
http://odur.let.rug.nl/ahc/

National Archive for the History of Computing
Houses the UK's most important collection of documents relating to the history of computing, and encourages interest and study in the history of computing more generally.
http://www.chstm.manchester.ac.uk/research/nahc/

Computers in the Computer age
A look at the progression in computer technology throughout the ages.
http://www.mcevansw.pwp.blueyonder.co.uk/