Light Table

An interactive IDE that lets you modify running programs

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Oh, if you need an excuse to have a crack at Light Table/Clojure - check out Quil. It's a Clojure wrapper for Processing — I find Functional Programming really suits making pretty pictures :) https://github.com/quil/quil
Recently open-sourced after a successful Kickstarter campaign. Currently supports clojure, python, html/css/js.
and ipython support!
Totally awesome IDE - way more fun learning Clojure with a modern tool instead of Emacs. Haven't had a crack at doing swooshy JS stuff with it yet but looking forward to that too!