ScottGu talks more about Atlas... I've said many times that I believe that projection based web apps harm humanity. It's an extreme position, but unfortunately true. The horrible interactivity, limited usage model, reliance on connectivity, bad typography, ... I can go on. However, they are required. In much the same way that keyboards cause you physical pain when you use them too much, I think that web apps are good when used in moderation. The thing I love about Atlas and Ajax (well, really DHTML) is that provided you can figure out how to do it - it helps make the human experience better. Whenever you build an application you should feel required to make the application as rich as possible. Hopefully with Atlas we can raise the minimum bar for the web experience, and remove some of the harm out of the web.