I can second Nagle's book. They could charge its weight in gold, and it would still be worth every penny. Where Davidson's freebie gives you the lay of the land on pricing and talks a bit about some dynamics, Nagle's "Strategy and Tactics" covers the details in some depth. You learn how to deploy pricing as part of your marketing strategy. They not only back up their points with detailed examples, but they explain why the pricing worked (or didn't) as it did. Simply invaluable.

For the OP, I would also recommend "Blue Ocean Strategy": http://amzn.com/1591396190 . The authors address how to move beyond mere competition, and pricing is one of those ways.