Um aplicativo:
DeskPins can be used to make any application topmost, that is, to keep it above all other windows. Just grab a pin from the DeskPins icon in the system notification area (a.k.a. taskbar tray) and click on any window. This functionality is identical to the "Always on Top" setting found in some programs. With DeskPins you can add this feature to any program!
Outro aplicativo:
PowerMenu is a small application I wrote back in 1998 that some extra menu items to the windows control menu in addition to the standard "Close", "Maximize", etc options. The extra menus are: Always On Top, Transparency and Minimize To Tray.