A little off topic, but I notice a lot of people new to Emacs and Lisp banging there heads trying to get Slime set up and running, when Emacs has excellent Lisp support right out of the box. Slime is excellent, but complicated (even by Emacs standards). I wouldn't recommend a user installing it until a specific need arises. I can't imagine trying to learn Lisp, Emacs, and set up Slime all at once.