I use the Clip-It-Up Mini and sleeve protectors for storing cds in binders from the office supply store for my acryllic stamps. I got the idea from Jennifer McGuire's blog. What I really love about it is that I don't have to take my stamps off their sheets. I just slide the whole thing down into the protector that I cut in half and I clip it in the right category. It makes finding my stamps a breeze!
Here's Jennifer's video of how she does hers.