After trying various storage ideas (first I just had the boxes on a shelf, then I moved to the Plano Flip Up thingy, then to a binder with baseball card pages - that one was a really bad idea!) I think I have finally found something that works for me. (I have a Gypsy but I still use DS quite a bit, so I need easy access to my cartridges)
Here's a view from the side
and here it is from above
I bought a clear flat storage box @ The Container Store and made boxes for each of my cartridges. I got the idea for the boxes from Okie's blog (okieladybugsscrapnmore.blogspot.com WOW that's a long blog name!) I made a few adjustments so that the labels were visible from above. The box will hold up to 84 cartridges and it fits perfectly on the shelf above my Cricut.