I change the line on my reels at least every year, sometimes more. I always had the problem of the darn spools, half full, lying around without a good way to organize them. I also would keep some spools on the boat for emergency respools, with the same organization problem, not to mention the various test of leader spools floating around the boat.
I found the answer. I saw it in this years Berkley Fishing catalog.
The Line Station
This thing is great. It holds 6 regular size spools or 2 quarter pound spools. The front opens up to access 6 spots to pull line from. Each location has a spot to lable the line on that spool. I bought mine at Bass Pro in Denver. Its fairly small, so it will not clutter the boat.