I really like the bobbin savers (round rubber donuts). I have three in different colours. One for each of my two machines, and one for pre-wound bobbins that fit both machines. I rarely wind bobbins anymore, prefer the pre-wound ones from Superior Threads. My regular bobbins mostly have decorative thread on them these days.
My thread is stored out of the sunlight in a drawer for the larger spools, and in a nifty plastic container with two layers from Pep Boys. Just the right height for most spools.