Concise, mainly lists with small definitions. Covers template files, header/bloginfo tags, template tags, navigation, a bunch of misc. useful functions, and the loop.
Includes most of what is offered in Morey and Wallagher as well as keyboard shortcuts. List is concise, most functions not defined (though usually self-evident from function name).
Not exactly a cheat sheet but covers a significant number of WordPress terms and concepts, worth at least checking if any are unfamiliar – includes a ToC at beginning of article.