To this I would add The Simple Truth, and perhaps a few expositions of failed intuition, a la Hindsight Devalues Science. Others have already mentioned Something to Protect and Joy in the Merely Real - as the "motivation" behind rationality. Finally, Newcomb's Problem and the Regret of Rationality, or anything that clearly separates The Way from Hollywood stereotypes.
Followup to: The Most Frequently Useful Thing
What's the number one thing that goes into a book on rationality, which would make you buy a copy of that book for a friend? We can, of course, talk about all the ways that the rationality of the Distant World At Large needs to be improved. But in this case - I think the more useful data might be the Near question, "With respect to the people I actually know, what do I want to see in that book, so that I can give the book to them to explain it?"
(And again, please think of your own answer-component before reading others' comments.)