> The first version of Compiz was released as free software by Novell (SUSE) in January 2006
> Build 5048 (built on April 1, 2005) was the official WinHEC 2005 preview build, ... The Aero visual style made its first appearance in this build
Sure, technically Compiz was released before since the official Vista release date was Nov 2006, but work on Compiz started AFTER Aero was shown.