Aarrrggggghhhhhhh - sorry, found my own answer (I think).

Should have done a better search first :D

http://simplymaya.com/forum/showthread.php?t=24490

I have recently got back into learning Maya, and currently modeling a car.

Having hit a couple of hurdles, I was trying to find how other people modeled their cars, and found a mesh online.
...

Part 6 front view

Part 6

Part 5

Part 4

Part 3

Part 2

I've had a 'play' with a couple of tutorials, but this is the first one that I have stuck with.

Thought I would post my progress at the end of each part of the tutorial . . . . . . . .

Part 1

If you have a curve and select it, then holding shift down select a face - hitting extrude, will extrude the face along the curve.

Is this what you mean ?