I have lots of cutters that I keep in plastic shoe boxes from the Container Store.:
I can get three "layers" of cutters in each box. I wash and dry my cutters before going in. Since I've been using these I've no longer had problems with rusting. The cutters/ boxes are divided into categories such as:
Christmas (3 of these)
home (telephone, mixer, houses, etc.)
etc., etc., ...
I put a label on both sides and the top of each box. I stack these in a closet and can easily see the labels from any angle.
I keep a running list on my computer. Each category has sublists. Christmas
Copper - 5
tin - 3, 4, 5
copper - 6 whimsy
tin - 3
coated - 3
I have a three-ring binder that I keep these printed lists in. I also trace my cutters and make photocopies. I call these my cookie coloring pages. When I want to try something different, I print off a sheet of them and draw out my designs. I know what I want to do and how many icing colors I'll need. This is great for kids, too.
I also have an idea binder. I keep photos of my cookies along with others I find on the web. Cut-outs from magazines, newspapers, etc. Anything I think might make a cute cookie. I always try to make things my own, but inspiration can come from anywhere. I hope this helps and isn't more information than you wanted.