Open GL on the mac and XGL on Linux bring some very cool graphical effects to the respective OSs. Some 3rd party apps for the mac can give us mac users some of the GUI goodness built in to XGL; like how VirtueDesktops gives us multiple virtual desktops with nice OpenGL style transitions between desktops or like how Afloat allows an OS X user to set the opacity of any non-finder window. But my question is, is there any app for OS X to get the same wobbling window effect like you get with XGL when you drag a window.