I want this type of thing to happen more often. Designer posts UI concept for the world to see, developer likes it enough to turn it into an open source project.
Doesn't hurt that it's a beautiful concept, too.
This is the kind of stuff I'd like to see more of on Dribbble (versus perspective shots, etc.). Smooth!
Someone should tell the Gridforms guy: http://kumailht.com/gridforms/
reminds me of http://www.csskarma.com/lab/plugin_slidinglabels/