OK, this has to be the coolest web app I've yet encountered. So desktop-like you forget it's running in your web browser! Part of that must reflect its software foundation, which isn't javascript or flash or Air, or any of the other possible languages for Web 2.0-style apps. No, it's Cocoa--the same language (a derivative of Objective C) and framework Apple uses for its desktop apps!

The framework used is called Cappucino, a fairly new open source project that "makes it easy to build desktop-caliber applications that run in a web browser."

I'm all over this... definitely!