Intelligent Machinery - an essay by Alan Turing

here's another one with a beautiful cover

http://www.npl.co.uk/turing/intelligent-machinery

some related materials:

http://transcriptions.english.ucsb.edu/archive/courses/warne...

http://www.dreamsongs.com/Searle.html

http://www.loebner.net/Prizef/TuringArticle.html

A somewhat more readable copy can be found at "http://www.alanturing.net/intelligent_machinery/.