All the major
java IDEs all support clojure via plugins. Intellij IDEA (the best java IDE
) has the La Clojure plugin, which has become very good with the latest IDEA 10 version. Eclipse has CounterClockwise, Netbeans also has one (I forget the name...). And of course you can use Emacs with the Slime-Swank combo, which a lot of the hardcore clojurians use.
All of these are good alternatives.
Best regards,
Stian