I have over 500, but only about 18 or so that are quilting dies. I have an excel spreadsheet with the die name & where it's stored. What I really use a lot, however, is an old fashioned Rolodex. A visual is better for me. I have the one that takes the 3X5 size cards (which I have a die for
) I often have several cards for each die, like filed under strips, then maybe another section for 2 1/2 inch compatible etc. Because dies intended for paper have names that are not very descriptive, "Box 3", for instance, I can have a picture of the completed item. You could have diagram(s) of blocks that use that die. I have noticed that the quilting dies are almost random sizes, which isn't the case for the paper dies. My husband and I built a workstation for storage. I have found the best way to store are cubbies that let you store the dies vertically, like books, and drawers. If at all possible, don't store them in a stack, which makes it hard to get them out as the one you want is always on the bottom. Label the storage area and cross reference that location on your excel file or card list. Here's what my storage area looks like:
http://www.quiltingboard.com/mission...n-t240642.html
Before we built the unit, I used milk crates turned on their sides like cubbies. If you have a cross reference list, you can store them by the size of the die. Not the most intuitive, but it makes the best use of space. I use a label maker to also label the die with the storage location to make reshelving easier.