Thanu Padmanahhan's book, Sleeping Beauties in Theoretical Physics is a great find. It's reasonably accessible for a technical tome on theoretical physics, it has an interesting framework that makes the connections between chapters on very different subjects coherent, and it covers a number of interesting topics, including ones that I'd thought I'd have references to in other books but my knowledge of them must have come from papers. The feature that Padmanabhan uses to categorize physics is similar to the one used by Griffiths in his Introduction to Electrodynamics: a cube has eight vertices, and each of these vertices is a type of physical theory. Each of the eight vertices has one of three Boolean values: gravitation, relativity, and quantum. If the effect is accounted for, the value is on, if not, it's off. The vertex where they are all off is Newtonian Mechanics (without gravity) and the far vertex is a Theory of Everything (or somesuch, he calls it...