Originally posted by robtcorl Very true.
I can add a few to that list:
The traditional cable operated handbrake. (Most new cars it's just a button and the handbrake engages or disengages electrically.)
Underfloor heating. (OK, only Cadillacs in the 1940's had that feature!)
The little pull up stalk on each door to unlock the doors from the inside.
Hydraulic power steering. (You guessed it - going electric on most new cars because they need it to be electric for the lane keep assist anyway.)
The roof lining. (as a fabric over bows - long gone!)
Vinyl tops.
Woodie wagons!
Mud flaps.
In wheel sensors on expensive cars to monitor tire air pressure. (These days it's simply done by the car's computer system evaluating tire rotational speed in all four wheels. If one is rotating at a different speed to the others, the car knows that one's got to be at a different pressure.)