What is "lisp"
Introducing
The LISP name is derived from "List Processing". It is a language originally created as a practical mathematical notation for creating computer programs. See the article on wikipedia for more information.
Hello World in Lisp
;;; Hello World in Common Lisp
(defun helloworld ()
  (print "Hello World!"))
Popular dialects
Free Lisp Programming Books(all in English)
- Common Lisp the Language, 2nd Edition
 - Common Lisp: A Gentle Introduction to Symbolic Computation - David S. Touretzky
 - Common Lisp Quick Reference
 - Let Over Lambda - 50 Years of Lisp
 - Natural Language Processing in Lisp
 - On Lisp
 - Practical Common Lisp
 - Successful Lisp: How to Understand and Use Common Lisp - David Lamkins
 - Sketchy LISP - Nils Holm