Can't believe you guys didn't notice this.

Via /.:


"SproutCore is an open source, platform-independent, Cocoa-inspired JavaScript framework for creating web applications that look and feel like Desktop applications. Learn how to combine SproutCore with HTML5's standard offline data storage technologies to deliver a first-class user experience and exceptional performance in your web application."
Link to article

http://www.sproutcore.com/ (really slow)

Seems like Apple is stick it's nose into the web development game finally, by opening up the framework they used to create MobileMe.

Haven't had time to play, but it looks like you need Ruby to develop with, and I'm not even sure it's available for Windows. Thoughts?