As everyone else says, take "Sequences" out of the title. ("The Sequences: 2006-2009" is a strong contender for Worst Book Title Ever unless you want no one other than existing LWers to read it, and anyone who has advised you otherwise should never again be asked for book-naming advice.)

"Rationality" is probably too cumbersome a word (possible exception: what if that were the whole title?); "thinking" or "thought" or "reason" might be OK.

"How to Win"? (I worry that that's dishonest; it's insufficiently well established so far that rationalists -- in the sense of people who think in the ways Eliezer advises -- do actually win in the real world.)

"Thinking: right and wrong"? (Riffing off Kahneman's title, of course. Might be mistaken for a political book -- indeed, it wouldn't be a bad title for a smug conservative/libertarian treatise.)

[EDITED to fix a typo.]