Seems like most comments here talk about the "intuitive" aspects of the design. Which I agree with -- an app should ideally be intuitive. That said, being int

Seems like most comments here talk about the "intuitive" aspects of the design. Which I agree with -- an app should ideally be intuitive. That said, being intuitive really only is an issue during the user's learning curve. As every vi/emacs user knows, sometimes you can be way more productive once you adapt to the computer, rather than the other way around. Gmail, for instance, has a very poor UI from a traditional perspective, but I find it very easy to be productive once I learned the keyboard shortcuts. Intuitive is generally a good thing, but in and of itself isn't the most critical requirement for being usable, IMO. I prefer clustering of concepts, simplicity of presentation, and workflow optimization much more important. But I still try to design my apps to be intuitive. After all, why not build on common concepts?