Its in beta right now, be careful. But its a nice idea, although there are applications out there that do the same (sorry it has been a while, so no links/names)
--not related to your link--
"true" webdesign was always bordered with WYSIWYG and/or online code generators.
That´s the reason I think there isn´t much activity around here. Today, most people throw nukephp or typo on the servers and click around those
editors, not really grasping what they do.