Patter Cross uses a Rolodex for hers:
Triple the Scraps: Rolodex.
I gave it a go and HATED it! For me, it was too unwieldy and I couldn't see them all at once to compare, etc. Mine are all stamped on ATC-sized cards (2 1/2" x 3 1/2") and stored in
trading card pages by theme, and the panels that the stamps themselves are on are organized in the same order as the stamped cards, in
page protectors in
bins, appropriately labeled...