Tip of the day: a floating Cocoa HUD window
The idea is quite simple: In your Cocoa application you simply take the floating point window and set the style mask to special combination with HUD, Utility and other flags set.
Download project: floatinghudwindow.zip
Update: If you use setContentBorderThickness you can make the bottom borders rounds:
Self.NSWindowMBS.setContentBorderThickness( 4.0, NSWindowMBS.NSMinYEdge )