1. Measure and label your fabric when you store it.
2. Decide if you are sorting by color or some other method.
3. Use the comic book boards to fold them on and store them. Note that the only ones I was able to find were only acid free on one side, and there is nothing on either side to tell you whether it is acid free or not. Factor that into your decision to use or not use comic book boards. I have thought about cutting up empty cereal boxes and using them for folding and storage. I do use them for storing strips I have cut for checkerboard quilts.
4. If you see fabrics in your stash that you know you won't ever use, donate them to a local quilting guild.
I'm sure other people have more ideas.