From the Cappuccino blog:

Cappuccino is essentially a port of the GNUStep frameworks (or Cocoa as more people are familiar with them), and it aims to fundamentally change the way applications are written on the web.

This is a really exciting development in JavaScript framework land, with a completely different take on the matter. It’s hard to think that Apple aren’t kicking themselves that this didn’t come out before they built all their MobileMe web apps using SproutCore.