On 14 March 14 2006, Leslie Lamport gave a wonderful talk called Thinking for Programmers to first- and second-year undergraduate students at the University of Lugano's Faculty of Informatics. The following day, he gave a public lecture called How to Write a Proof at the University's Aula Magna. The above links lead to my accounts of these events.
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If you're a C programmer with some spare time, take a look at the mod_virgule project page and help us with one of the tasks on the ToDo list!