If I had an entire room to store the games in their original cases, I'd just as soon do that. However, I don't have that luxury moving into a 1-bedroom apt with a wife. So, I need to condense a game library that consists of roughly 750 games I've accrued over the years. I put together a neat setup for cartridge games, and a CD book for the CD games works well enough, and even using a baseball-card book for GBA and GBC games works great, but I have yet to find a sleek solution for floppy disks (which I can use a similar setup for cartridges, but it's more difficult to develop a label that I can place on the top to tell what game each is) or GCN games. I saw a 12-GCN-disc book for sale at several retail locations, but then I'd need 5-6 of them.
I see a hard-top Nyko case that holds 40 at ebgames.com, and custom-made sleeves at some other places (expensive though...20 bucks for 25 soft plastic sleeves?). I even searched for a mini-disc wallet, which apparently doesn't exist beyond a capacity of 10-15 mini-discs.
One would think with mini-discs and GCN games being the size they are and the relative frailty they are, that someone somewhere would make a wallet catered to them. Tried the CD book, but the games just don't stay in the sleeves.