There has been this concept for quite sometime that there should be one click install for the applications in Linux. This applies to the themes and widgets of wordpress too 🙂 and quite some applications are taking it seriously (like wordpress for example).
But how about the application to do one-click install, there are couple of issues with that but still there exists at least one way. A nice blog here.
If you want to know more about one click install, you can start here.