Validating Board Order
There was (I believe) a discussion a while back about whether boards could be marked on the side so as to make it easy to verify they were in order from the side of a stack.
The point as made that as organisations (especially the EBU) use many sets that tend to get mixed up, so a simple diagonal stripe (or similar) wouldn't work.
Today I used a set marked with numbers on the edge. It is incredibly easy to identify when they are out of order without "flipping through" them, and (providing the numbers are always put in the same place), it doesn't matter if board sets are mixed up.
I'm sure others have their own methods, but when I think how many hours I have spent verifying board order in Swiss events...