Actually it goes deeper than that:
CD3:
Mazda6, Fusion, Edge, Milan, MKZ, MKX, Mazda CX-9,
D3:
500, Montego, Taurus, Sable (now discontinued), MKS, MKT, Flex, soon: Explorer, Volvo XC90
I have nothing against shared platforms, but they should at least make a really good base platform and use...