Seems there's a lot of resentment on the forums at http://www.myford500.com as Ford is renaming the Five Hundred the Taurus. In my uneducated English opinion, that's crazy for two reasons:
1) The Taurus was a bland fleet car that was not updated and left to die
2) Ford blames the Five Hundred name for low sales (it has nothing to do with zero advertising on Ford's part)
I'm not North American, I didn't grow up here, but this doesn't make sense to me. The Five Hundred has an identity as a large, roomy and safe vehicle. The earlier complaints of it being underpowered are no longer valid with the new 3.5L V6 engine. Ford has revamped the exterior style, and while I may not necessarily like it, I do think it brings more cohesion to the car.
Disclaimer: I drive a 2005 Five Hundred, though it will be my last Ford.