objective-j
Get flash to fully experience Pearltrees
Undo and redo are two of the most essential features in any real rich application experience. In many cases, your user has already turned these commands into reflexes, automatically hitting the proper keys and expecting the right thing to happen. Unfortunately, this is often left unimplemented by developers when making the transition from the desktop to the web, serving as a rude awakening to your users when they make a mistake that can’t be undone.
Add Undo and Redo to Your Web Application With Cappuccino
Cappuccino Web Framework - Build Desktop Class Applications in Objective-J and JavaScript
...if you use Cappuccino, those apps will automatically look and behave like ... desktop apps - with zero learning curve on the developer's side. He or she can simply focus on building an kick ass app instead of trying to re-invent basic UI functionality every single time. I can see the allure of Objective-J / Cappuccino for building desktop-like Web applications.