Monty Hall Redux

The "Monty Hall problem" (here and here) is one of the most widely-discussed and popularized math problems of all times, and it just keeps going and going. There will soon (well, June) be an entire book out devoted to it from Jason Rosenhouse: "The Monty Hall Problem: The Remarkable Story of Math's Most Contentious Brain Teaser." Should be a good read for mathematicians and lay folks alike.