Slime + Clojure + Swank
Install clojure-mode: in emacs scratch buffer, input the following
(require 'package)
(add-to-list 'package-archives
'("marmalade" . "http://marmalade-repo.org/packages/"))
(package-initialize)
then
M-x eval-buffer
M-x package-refresh-contents
M-x package-install clojure-mode