PBS | I, Cringely . Bob Don't Know Diddy: Post-Election Reflections on Polls and Other Stuff: "Two weeks ago, I predicted that advances in communication technology were making Presidential polling less accurate, and that an underreported youth vote for Kerry would surprise us all. Well, it didn't. Since I'm a believer in prognostic accountability and also not a wimp, it is only fair for me to first acknowledge that I was wrong and then to explain why, in retrospect, I believe things worked out the way they did. The short version comes down to the unreliability of youth."
Worth reading, as always