Clicky Gone - Clicky Gone allows you to hide your selected windows from view, this includes the taskbar button...
Glass2k - Small little program that allows Windows 2000/XP users to make any window transparent.
mapmywindows - A small program to show and hide windows in X window system.
WindowTop - Easly set any window on top, just move the mouse to the top area of the window.
TopMenu - TopMenu is a functionality clone of ...
Stay On Top - Set a window to stay on top with this single-function but handy application.