I never thought of it before, but they are pretty much added together at my house...
somewhere I recently heard of someone combining them to make it easier. Irrelevant to me, though, as they are on the same kitchen item, just on different ends! lol
Now that you bring it up, I reach for the pepper grinder (that has a salt shaker on top) and give a few twists of the pepper grinder, then a few shakes of the salt. Maybe I'll go crazy and do it in the reverse order next time ;o)
Keep the polls coming, rvb!