On Lisp: Advanced Techniques for Common Lisp is a book by Paul Graham on macro programming in Common Lisp. Published in 1993, it is currently out of print, but can be freely downloaded as a PDF file.
See also Anaphoric macro Hackers & Painters - another book by Paul Graham
References
External links On Lisp home page Free versions of "On Lisp" On Lisp in pdf-format On Lisp in multiple HTML files On Lisp in multiple HTML files (white on black) On Lisp in a single HTML file Piecing Together a Printed Copy of "On Lisp" -- includes the nine missing diagrams.