These are two simple demo programs making use of the AmigaOS 4.1 compositing
engine. 

ScreenThumb displays a mini-preview of the workbench screen in a small window,
updated in real-time.

Lens is a program that can zoom in on any spot on the screen using the mouse
wheel.

These are just demos for now, but they might give a hint at future possibilities
of the compositing engine. Enjoy!