In September, 2004, I posted a query to the Types list asking people to name the five most important papers ever written in the area of programming languages. This page collects the responses I received. (A few are missing because I am still tracking down bibliographic information.) Many thanks to Frank Atanassow, David Benson, Nick Benton, Karl Crary, Olivier Danvy, Mariangiola Dezani, Dan Friedm