Thanks for posting this. I've recently taught David Mamet's 1992 play, 'Oleanna', which focuses powerfully on the impact and influence of political correctness. Students' reactions to this always generate heated discussion and debate.
Lexicographer Erin McKean's blog - the premise for which is also given at the end of her 2007 TED talk. There are links to her articles for the Boston Globe and to other potentially useful articles and resources on the web.