When I was growing up, patterns were most commonly bought in at stores. Nowadays, many patterns are available online and through PDF files. While I love being able to store these patterns on my computer (and a back up hard drive for extra security), I also like seeing the printed version of these patterns in a book.
Once I had accumulated a small stash of e-patterns, I developed this organization system that helps me keep all my patterns neat and easily accessible.
I use a pretty 1" binder with plastic page protectors to store my patterns. Each page protector holds one pattern and the pattern pieces. Keeping all the printed information for each pattern in one plastic sleeve makes it easy to grab one pattern and flip through the binder quickly to see all the patterns I have.
How do you organize your patterns?