Xavi Beumala has submitted 2 great samples for Tour de Flex. The first is an extensive implementation of the Coverflow layout utilizing standard 2.5D APIs and the standard Flex 4 layout mechanism.
Location: Other Components > Layouts
Xavi's next example is a reversible dual panel, or a 2-sides panel, component with a frontView and backView along with multiple ways to present the panel, such as flip, wipe, zoom, etc.
Location: Other Components > Effects