There's a conference in his honour this weekend in Manchester, where he did much of his work. On the list of speakers are Hoare, Knuth, Penrose, Cerf, Kasparov, Fred Brooks, Rodny Brooks, Shamir, and many others. It's quite exciting to get so many luminaries in the same event.<p><a href="http://www.turing100.manchester.ac.uk/" rel="nofollow">http://www.turing100.manchester.ac.uk/</a><p>Edit: It's also quite expensive!