Gordon S. Novak Jr.
Free software, information, links.
http://www.cs.utexas.edu/users/novak/

PC AI: Lisp Programming Language
Page with brief description, very useful links with annotations for vendors, search engines, more: references (linked and non-linked) for articles, books.
http://www.pcai.com/web/ai_info/pcai_lisp.html

Lemonodor
Weblog featuring Lisp news, events, and commentary.
http://www.lemonodor.com/

Hello, World Program
Lisp version of this canonical first program.
http://www2.latech.edu/~acm/helloworld/lisp.html

Common-Lisp.net
CL development resources, good start point for new programmers. Free: CVS, mail lists, web and FTP space.
http://common-lisp.net/

Online Publications by Erann Gat
Lisp papers: Lisp as an Alternative to Java; Complete Idiot's Guides to: Special Variables and Lexical Closures, CL Packages; Locales: First-Class Lexical Environments for CL; robotics papers.
http://www.flownet.com/gat/papers/

Association of Lisp Users: ALU
Well organized, over 100 pages of information on Lisp: references, books, tutorials, free and commercial implementations, free software, events, conferences, history, organizations, other resources.
http://www.alu.org/alu/home

P.S., Parenthetically Speaking
Set of articles on several aspects of Lisp and related issues.
http://www.nhplace.com/kent/PS/About-PS.html

Lisp
Paul Graham Lisp essays (including Beating the Averages), history, FAQ, code, many links.
http://www.paulgraham.com/lisp.html

History of Lisp
Source code, design documents, references, other material on original Lisp I/1.5 system, and many follow-ons. Project of Computer History Museum's Software Collection Committee.
http://community.computerhistory.org/scc/projects/LISP/

Lisp: TunesWiki
Unique description, links. [Open Content]
http://tunes.org/wiki/Lisp

Jeff's Lisp Page
Related links about Lisp, papers, book reviews, programs, Net articles, from a variety of sources.
http://www.aiai.ed.ac.uk/~jeff/lisp/

CMU Artificial Intelligence Repository
Collection of files, programs, publications, of interest to Artificial Intelligence researchers, educators, students, practitioners.
http://www.cs.cmu.edu/afs/cs.cmu.edu/project/ai-repository/ai/0.html

Kent Pitman's Public Page
Publications, postings (mostly Lisp related); political thoughts, links.
http://www.nhplace.com/kent/

HyperMeta, Inc.
Common Lisp (CL) consulting, tools; Web design, hosting, graphics; print layout. By Kent M. Pitman.
http://www.hypermeta.com/

The Common Lisp Directory
Collects all possible resources for the CL language: libraries, tools, software, documents, events, groups, organizations, people.
http://www.cl-user.net/

Lisp Programming Language
Growing article, with links to many related topics. [Wikipedia]
http://en.wikipedia.org/wiki/Lisp_programming_language

Readable S-expressions and Sweet-expressions: Getting the Infix Fix and Fewer Parentheses in Lisp-like Languages
Proposal to replace pure S-expressions with more flexible mixed alternative. David A. Wheeler's Weblog.
http://www.dwheeler.com/blog/2006/06/17/#readable-sweet-lisp

Arto Bendiken
Personal Weblog of Lisp programmer, original writings, speculations, code.
http://bendiken.net/