The National has a floor plan along with a list of dealers where you can map the dealer to table # on the floor plan. I usually take that floor plan, enlarge it, and print it out in more manageable "sections". As I go through the show, I'll mark up the floor plan sections, usually putting a big black X through the table that has nothing of interest to me. The others I might put notes on the floor plan, or jot down the table number with a note about what was interesting on the back of that page or on a separate sheet of paper. If you have multiple card sets/types you are looking for, it's good to come up with a system to easily mark directly on the floor plan (if possible).
Please note: I have found this method to work reasonable well for the first (and second) pass, but come Saturday, the value seems to get reduced to emergency toilet paper fodder status.
