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http://www.codinghorror.com/blog/archives/000666.html - Programmer’s Bill of Rights (comments)
Productivity Tips for Programmers
http://research.microsoft.com/displayArticle.aspx?id=433 - 2 screens better than 1
http://blogs.ittoolbox.com/pm/productivity/archives/try-three-marie-1828 - 3 monitors per person
http://www.codinghorror.com/blog/archives/000912.html - on multiple windows vs monitors
Multiple display monitors is a paper saver as well in that you no longer need to print how-to software development articles to follow along.
Personal anecdotal evidence says I’m happier with two monitors. And that I find it easier to view data in multiple programs with such a setup. Does it really speed productivity? Hey, this is anecdotal evidence, buddy!