One book I haven't seen mentioned is Cocktails in New York. It is obviously New York centric, but I've found that it is a great mix of proven classics and creative mixes. Each recipe is linked to a NYC establishment, which makes it as much a bar guide as a cocktail book. Peppered throughout are short historical essays on the cocktail and info on spirits and the like. I've found it to be a book I can leaf through and read, not just a destination for a cocktail recipe. I definitely suggest it for those in the NY area. It is a few years old, so you can likely find it at a deep discount.