Mike Caro's Fundamental Secrets of Winning Poker

This is a slight book that covers a lot of topics. I think the most useful advice addresses limit hold 'em. Caro cautions:
"Abandon many straight draws against a bet if two suited cards flop. You often need a pair AND a straight draw to call."

Simple yet powerful. A player holding four parts to a flush will make his hand more often than a player holding four parts to a straight. And, if two cards of the same suit flop, you may only have 6 clean outs. And, you may make your hand on the turn, and bet and raise appropriately, only to get out-drawn on the river.

It's tempting to always call with a straight draw, especially in limit action, but finding a spot to save a few bets is what separates the winners from the losers.