Another good method could be a CD-booklet or binder with all pages fitted with slip pockets. They're bigger ones than the small 24-32 CD capacity wallets. I've recently bought one booklet that can hold up to 240 CDs. It may take more of these booklets to hold up to 1000 CDs if that's what you're looking for. But, at least it could also help so that you could have a sort of "card catalogue" of CD-booklets/binders on a bookshelf, organized in whatever way possible (i.e. alphabetically, by genre, numerically, chronologically, etc.)