This is a problem that really pisses me off. I try to keep my cars ding free. I park far away and walk, I never park next to coupe, I always park next to the nicest car in the lot. If I have to parralel park, i make sure there is plenty of room in front and back. I do this every time I park, but sooner or later I'll get a ding. Always on the bumbers first, but eventually on the side as well. I must admit though that the effort does pay off. I'll get the dings but not so bad and definetly fewer than if I were less careful, but damn, I really hate it when it happens.