I keep all of my stamps in binders on EZ Mount Storage Panels which are sorted into categories, such as Alphas, Words & Numbers; Flourishes & Shapes; Birds & Butterflies; Botanicals; Christmas; etc. You can get the storage panels with or without tabs. I usually buy clear stamps in sets. Frequently these sets contain stamps that are categorized differently so I break up the set and file the individual pieces wherever they belong. I also store the acrylic blocks on EZ Mount "pages" in the binders. Like many others who have replied here, I keep lists and sample sheets of the products I use.