Yes, always pick up the pennies -- always look forward to trips to the big city with the Mrs. cause I usually find the big money (silver coins) on the ground there.
In a parking lot, in a store, at the movie theatre, etc. I have no shame. I also still hop on the shopping cart and ride it back to the car in the parking lot. Let onlookers think what they will.
I've always wondered though. . . what if there was money on the floor in the bank? You can't pick up a candy bar off the floor in a store and call it yours; that is still considered stealing. If you pick up ground money in the bank is that considered robbing it?