Last week, I was at the Family History Library in Salt Lake City. I looked at dozens and dozens of rolls of microfilm, searching for records of my ancestors. Before I actually did any research, my friend, Donna Potter Phillips, gave me a handy tip. She told me to use a Post-it note to mark the drawer where I got my film for easy re-shelving. With about a dozen LONG aisles filled floor-to-ceiling with drawers of microfilm, this made great sense.
I took things one step further by using a little Post-It note pad full of the small notes. I would write down the film numbers on the pad, and take it with me, grabbing my limit of five rolls of microfilm at a time. That way, I didn't need to bring a piece of scratch paper with the film numbers on it and the Post- it notes. They did double-duty.
This system will work well in any research facility where you are required to re-shelve your items, even in repositories that are smaller than the Family History Library. After all, why search for the location twice?