Nationmaster Encyclopedia: Colossus computer The purpose, origins, and design of the world's first programmable digital electronic computer. http://www.nationmaster.com/encyclopedia/Colossus-computer
Bletchley Park Museum : Lorenz Cipher Machine Descriptions of the Lorenz cipher machine and the Colossus computer built to crack the code. Information on the rebuild of a working Colossus. http://www.codesandciphers.org.uk/lorenz/index.htm
Colossal contribution to the war effort Guardian article on the Bletchley Park computer museum, and the projct to rebuild the Colossus computer. http://raphael.math.uic.edu/~jeremy/crypt/guardian.html
Take a Tour of Bletchley Park Information and photos on the Colossus rebuild project at Bletchley Park. http://www.lightstraw.co.uk/bletchley/tour.html
How a Computer saved the world Article from the American Computer Science Association about the history of Colossus (and IBM's involvement in WWII). http://www.acsa.net/a_computer_saved_the_world.htm
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