Common Lisp Quick Reference is a free booklet with short descriptions of the thousand or so symbols defined in the ANSI standard. It comes with a comprehensive index.

This rather humble effort is by no means meant to rival the Common Lisp HyperSpec or any of the great introductory web resources and books. Its purpose is to give those who like a piece of dead tree in their hands a quick overview on things they know already, or some clue on what to look up elsewhere.