∞labs

appsAfloat

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

Best of all, it's free.

Download it now:

The Afloat 2.4 package (July 2011) includes the Afloat 2.4 plug-in and SIMBL 0.9.9.
Requires OS X Lion (10.7) or Snow Leopard (10.6).