I am starting to learn the Clojure programming language. Are there any recommendations for Clojure editors/IDEs on Mac OS X?
Update 2009-09-23: The Clojure space has changed tremendously since I originally posted this question. Many of the links below, especially those that refer to clojure-mode with Emacs, are out-of-date. The best Clojure IDE I found was the Enclojure Netbeans plugin which was recently released (2009-08-25).
Update 2010-04-30: Another very good article on this subject is Clojure IDEs - The Grand Tour by Lau B. Jensen. Also, for my own clojure development, I have actually moved to Emacs / swank-clojure.