I do have some in a folder called "downloaded patterns", but computers freak out sometimes and lose things so I wanted hard copies, too. I used to use a binder, but that ended up being ridiculous.
I now have a file cabinet for them. I've organized them by type as well as purchased patterns and free patterns. It's SOOO much easier than binders and more compact in the long run because I don't need shelf space. I use the file cabinet as a side table in my computer room next to a chair.