The web has an abundance of sites dedicated to various aspects of computing history. Here are some you may find interesting. Please email other good pointers to me.
A 1969 paper on the history of electronic computers
Some other books on the history of computing that you might find interesting:
A History of Modern Computing by Paul E. Ceruzzi
A History of Computing Technology by Michael R. Williams
The Dream Machine by M. Mitchell Waldrop
John von Neumann and the Origins of Modern Computing by William Aspray
ENIAC: The Triumphs and Tragedies of the World's First Computer by Scott McCartney
The Universal History of Computing: From the Abacus to the Quantum Computer by Georges Ifrah
Tools for Thought : The History and Future of Mind-Expanding Technology by Howard Rheingold