Journey, each short row that runs the width of the bed is marked with a 5 to 12 inch long piece of wooden stake of 1x2, using a sharpie marker. One is visible in the picture that has the Toad in it. In some beds, every other one is on the opposite side as the one next to it. Also, every coffee can that has the source seed packet in it is so marked, duct taped on, marked on a piece of heavy paper... actually the paper comes from cutting up the boxes that my cats' meow mix comes in.
The only problem I had with the system was remembering to keep the markers marked exactly the same. This is very important this year with all the outcrosses with similar names, such as flamboyant 2012 and flamboyant 2013 outcross #1. No mixups allowed!