OK, another brilliant app under Mac.
I really hope Mouser's Screenshot Captor could do this
and some post-processing special effects would be cool. OK I am trying to describe one, sorry for my bad English
Put the 'layers' in 3D view, separate the window layers Z-distence a bit, and view the windows from a tilt angle for extemely cool screenshot.
The screenshot will somehow like the Salesforce for Google Apps: Product Tour
Or just like Vista's 3D Aero switch but more realist and screenshot-like. The relative position of window remain unchanged.