I've reviewed Jason Rosenhouse's book on the Monty Hall problem. Overall summary: The book is very good and does an interesting job of discussing not just the original problem but variations of it, as well as what reactions to the problem can teach us about how humans estimate probabilities.
Better late than never, a new open thread. Even with the discussion section, there are ideas or questions too short or inchoate to be worth a post.
This thread is for the discussion of Less Wrong topics that have not appeared in recent posts. If a discussion gets unwieldy, celebrate by turning it into a top-level post.