A very good article. My favourite big plot twists (in films) are: 1) The Empire Strikes Back, 2) Les Diaboliques, 3) The Sixth Sense, 4) Planet of the Apes (the original 1968 film), 5) The Usual Suspects.

I write a lot more about plot twists here, which may interest you. It covers some similar ground to your piece. :)