Through a comment (found through Google) on Lambda the Ultimate I found an integrated development environment (IDE) for Lisp, called LispWorks Personal Edition. It is the free version of a commercial product, which has a few limitations (limited heap stack, five hours continuous operation, after which it shuts down, giving warning after four hours). This is perfect for learning Lisp, at least, for me who is used to GUI environments. I have CMU-Lisp on the command line, but I have no experience with Emacs, which seems to be a prerequisite for effectively programming CMU-Lisp.A good resource for learning Lisp seems to be Successful Lisp: How to Understand and Use Common Lisp, by David B. Lamkins.
