I really enjoyed reading Peter Seibel's Practical Common Lisp. Not sure if it is The Best. But it certainly is in my top-N list of books that I really enjoyed.

I really enjoyed reading Peter Seibel's Practical Common Lisp. Not sure if it is The Best. But it certainly is in my top-N list of books that I really enjoyed. Well written, great material. I did not end up doing much with Common Lisp but I did pick up some good things from the book.