I have two copters each with it's own transmitter.  The problem is they are different types of transmitters.  So in order to make it easier to remember the switch assignments on the transmitters, I created a Word file that contains labels. 

I thought I would post it here in case it would be of use for someone else.  Print it 100% and it will be the right size.  Then just cut them out and apply to your transmitter with some clear tape.