"Always on top" feature for Mac

"Check out Afloat.

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


Keep windows afloat (heh) on top of all others.
Pin windows to the desktop (new!)
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.
Resize windows from anywhere, not just the corner (new!), and more.


Afloat is freeware."