I separate all my SU! stamps by catagory ... background, nature, kids/baby, animals and bugs, holidays, occasions, etc. Those are all on a very large bookcase.
Then I have all my clear stamps and unmounted in a separate bin -- I have just started to acquire these so my collection fits fine. Eventually I like the idea of putting clear stamps in a three ring binder.
And single mounted stamps are in a second bin. Again, I don't have too many of these so this works fine for now. I see my clear stamp collection growing faster than the wood mounted single stamps.
Hope that helps some
I have pictures on my blog of my craft area and my bookshelf if you want to take a peek!