If you have just finished reading Cryptonomicon (like me) or you are just interested in nobel deeds of Alan Turing, you will find “The Turing Archive for the History of Computing” website (or simply alanturing.net) interesting.
Apart from being an extensive collection of documents this site has also an interesting way of presenting them. Instead of retyping and reformatting everything, they simply allow you to read and navigate through the scans. Click here for example. Such way of presenting things adds to the historic and important feeling…