This tiny app should be useful, unfortunately—even if a good starting point—its author fails in making it really useful. I currently use 5-6 kewylayouts, so my main orientation is the dashboard-like display of active kaylayouts upon switching them. Given their associated icon, this is sufficient.
This app would be indeed useful in case of full screen apps. the author must rapidly update it for 2 monitor use, which has become so comfortable in Mavericks, with both Apple bar up and Dock down.