download it
and it will add many window management features to most Mac applications:

• Keep windows afloat (heh) on top of all others.
• Make windows transparent with a gesture.
• Move windows from anywhere, not just the title bar.
• Turn a window into an "overlay" on your screen that doesn't hinder your work.
• Show a window's file in the Finder with nothing more than your keyboard.
• Do all of this with quick keyboard shortcuts, or a flick of your mouse wheel or multitouch trackpad.