I recently spent some time organizing the photos that I'm planning to scrapbook. I've been using Iris photo storage containers that I purchased from Amazon.com to store my photos for a while. I like these containers because each comes with 6 smaller containers, and together the set holds 100 4" x 6" photos. The only thing I haven't liked about the containers is that I have to open and look through each of the smaller containers when I'm looking for specific photos. When I reorganized my photos I came up with a solution to make finding photos easier.
The first thing I did was to number each of the containers and then I made an index for each of the large containers listing the photos in each of the smaller containers. I put the list, along with any 5" x 7" photos I had, right on top so that I could see at least part of the list without opening the organizer.
As I mentioned, I sometimes have 5" x 7" photos that go with the 4" x 6" photos in the smaller containers, and it works well to keep them right on top with the list. There's enough space that they can fit in there without getting bent, and it's nice to have all of the photos together rather than storing the larger photos in another location.
Often times I only have a few photos of each event, so I don't need a separate small container for each event. To make finding photos easier in the small containers I wrote the event title on a piece of white card stock and then used washi tape to attach the label to the first photo for each event. The great thing about washi tape is that it's removable, so I can take it off the photo when I ready to scrapbook it without worrying about damaging the photo.
This method of storing photos is working really well. If I was printing my photos at home I would probably just wait to print them until I was ready to scrapbook them, but I typically order my prints from Persnickety Prints and I order in batches, so I always have lots of photos to store.
Storing supplies in a way that it's easy to find what you're looking for is always a challenge, so any time I can find a process that works well I'm a happy scrapper.