I came here looking for examples of how people are using floating menus but couldn't find much. Would love to see what people are doing with this (and how to do it!)
One example here: Hot Key Cheat Sheet? - #70 by mkozjak
(Hopefully gonna get obsoleted by a native BetterTouchTool implementation soon, though)
I use a floating menu to span both of my monitors and run a web app in it. I use it as a screen saver.
I also made a shortcut menu that appears when called and shows my custom shortcuts for any app, but only while in that app.