QuickPop does just two things, but was designed to do them very well.
You can now define all those useless function keys on your extended keyboard (along with any other keys) to perform useful tasks.
This allows you to assign "Hotkeys" to up to 50 applications, documents, Apple Menu Items, control panels, FKEYs, monitor depth (colors) or speaker volume settings. When the "Hotkeys" are pressed from within most any application, the selected item will instantly launch (or change speaker or monitor settings).
QuickPop also allows you to have a menu pop up anywhere on the screen when you hold a key (option, command, control or shift in any combination) and click and hold down the mouse button. From this pop-up menu you can launch your favorite documents, applications, control panels, FKEYs or Apple Menu Items, change the monitor depth (colors) settings or the speaker level or switch to any other running application.