If anyone knows of a good documentation for Box2D 2.1a, a link would be greatly appreciated. It isn't fun trying to convert Box2D 2.0 code from most sources into Box2D 2.1a code in the process of trying to figure out what the hell I am doing.
And yes, I know of this but it only shows the various classes and methods, rather than explains them.
Of course, it isn't too hard to continue my stumbling along in Box2D; it's just that a good explanation would speed the development of the game engine I'm working on.