I've been reading through Seeking Wisdom: From Darwin to Munger by Peter Bevelin. It was mentioned on LW before here; I agree with Kaufman that his book is a better primer on business, but don't think that's the right comparison to make. Seeking Wisdom is much more of a primer to rationality ('worldly wisdom'), with the added benefit of drawing heavily from the well of Munger and Buffett.

I haven't finished it yet, but so far have been enjoying Bevelin's approach to stepping through biases: each of the 28 he lists is explained, demonstrated in a story, finishing with advice on how to avoid it. One of the things I've found interesting about it is that Bevelin knows most of the people that are part of the LW rationality canon, like Kahneman, Tversky, Gilbert, and Cialdini, but also knows other people that rarely get mentioned here in the context of rationality, like Munger and Buffett.