Common Lisp: An Interactive Approach - Stuart C. Shapiro's book is now available as a free download.
Successful Lisp - David B. Lamkin's book Successful Lisp has recently been published and is now available for purchase.
Workshop in Algorithmic Computer Music -
Prof. David Cope, noted composer, author and programmer leads participants in creating their own composition and analysis software using Lisp. The Workshop typically occurs in June.
The Dynamic Learning Center
gives University Professors and Students sample code and learning tools designed to introduce
future developers to the power of Common Lisp.
The Common Lisp Cookbook is an online recipe book containing code fragments for many Common Lisp programming tasks.
Basic Lisp Techniques,
a comprehensive basic Lisp handbook by David Cooper, Jr., designed to get you coding quickly (100+ pages) available here in Adobe Acrobat PDF format. (If you don't have Acrobat, you can download it from Adobe.)
Allegro CL
Examples and Utilities is a code repository of applications and
programs which demonstrate Allegro CL features and non-trivial ways
Lisp can be used.