Successful Lisp - This is a free Lisp book in html format.

http://psg.com/~dlamkins/sl/contents.html

Practical Common Lisp - Free Lisp book online.

http://www.gigamonkeys.com/book/

An Introduction and Tutorial for Common Lisp - A lot of the links on this page seem to be out of date, but if you're patient and hunt around you'll find various papers, examples and links to other resources.

http://www.apl.jhu.edu/~hall/lisp.html