Cathy, I do the same. Most of my manuals are not "originals" in that I downloaded them from the ISMACS.net site, but even the printed copies I have inside sheet protectors (acid free sheet protectors) and have them in a large "D-Ring" Loose Leaf binder, in order by the model numbers. That's as far as "organization" has taken me so far! It works, though, you can't miss that big green binder!
Jeanette