Roasted and salted. I haven't had one of those little greasy bags of them from the vending machine in ages.
I ate them boiled once when I was down south; had never heard of boiled before. They were pretty good.
There was a Planter's Peanut store downtown when I was a child. There was a huge barrel on it's side, rolling continuously while roasting peanuts in it.
Planter's Peanuts had the famous "Mr. Peanut" logo. A guy dressed up like him would often walk up and down the street, handing out mini bags of free peanuts.
When I got my first car, a VW Beetle, I painted the "Mr. Peanut on the driver's side door. He was easy to paint.