Idea for a Mac
idea for a mac app: turn web app into cocoa app.
this would work by using embedding webkit in a native app, set up to go to the web app address.
include functionality for changing the dock icon, menu elements, growl notifications.
I don’t know about writing something from scratch, but you can use Fluid (based on webkit) and Prism (based on Firefox) to exactly do what you need.
You can change icons, and some settings too!
Coolness