I'm starting this thread off with a Gallardo model, wich is sort of an experiment with seams in blender. And so far it's going great, so I thought it was time to share it. This is the result of about 8 hours modeling.
Side note: The renders are just to make things look smooth and pretty, not to make it look like actual car paint.

This is the old back side, wich I wasn't satisfied with, so I deleted it.

Here's the current WIP back.

Here's my (simple) render setup, which I've uploaded it to show you that my camera is parented to an empty mesh (the pink dot), this way it has a focus point, it is less likely to rotate the wrong way, it can be zoomed by scaling the empty mesh and I can make a turntable render when it's finished. You should try it.