Mine are in a binder... with my REAL Dreamcast games.
Back in 2003 for some STUPID REASON, I threw out all the cases and manuals, thinking just having a binder would be better. *facepalm*
I only have 3 CIB Dreamcast games and about 50 or so official Dreamcast game discs. THOSE are the discs I've actually considered making cases for... But I don't bother because I'll just be reminded of what an idiot I can be sometimes.
Oh, I also threw out the KEY for Phantasy Star Online because I thought I'd never play it online again.