TEILAS  Simply phenomenal. Far more useful than it might initially appear.  
(Version 5.0.2)

TEILAS  Excellent utility. When Snow Leopard was first released, window management felt broken without Afloat. I primarily make use of the ability to resize and move windows without having to click a particular part of the window. My only complaint is that it doesn't work with Carbon apps (Photoshop, iTunes, etc.), but I can understand the technical limitation.  
(Version 2.2)

TEILAS  @ENEFEM: You can indeed use this plug-in with Inquisitor. In Glims' preferences just turn off the functions that Inquisitor handles.  
(Version 1.0b8)