Nah - I just do my utmost to keep unpleasant smells out. Vacuuming it regularly helps a lot - other than that the car just smells of a combination of new-upholstery-smell and my patented "Essence De Giraffe" after-shave.
I'm with Gromit on this one - Vacuuming regularly and keeping the interior clean keeps it smelling nice. I do use leather cleaner and conditioner every couple of months which maintains that "new car" leather smell quite nicely.
Mindstorms, what type of perfume do you use? one that clips on an air vent?