Exciting times in Lisp land ! This is not only super useful, it's also amazing how it was built: it is a fresh Weblocks app, the venerable CL web framework, that abstracts the need of writing any JS. It's a server-based, components-based framework to build dynamic, ajax-based web apps, without a line of JS. This coupled to the interactive nature of development in Lisp makes a pretty unmatched experience. (
http://40ants.com/weblocks/quickstart.html)