I don't know about the salad plate, but a couple years ago I had Regis and Kelly on. Kelly was telling a story about how smart her kid was. But it turned out to be a handy trick.
Put your hands up, now touch the tip of your first fingers to your thumbs, and look at it. On the left hand it makes a b, right hand a d. So bread plate goes on the left, drink glass is on the right.
With salad, we usually just put the salad plate on top of the dinner plate, and after we eat the salad, then we just remove the plate.