Last week, we released Sandvox 2.7. It includes a neat tweak to the Host Setup Assistant, which you may have seen elsewhere:
My colleague Dan Wood has also recently been discussing this UI pattern.
I decided to make it a re-usable component, since "Show password" is something I find myself wishing more apps offered. And thus KSPasswordField was born. Go check it out and, hopefully, include in your apps where appropriate.