Here are a few well designed jewel boxes:
Top: Booklet style, cardboard exterior, thick cardboard hinge, plastic insert holding CD glued to cardboard. Removable booklet inside. Pros: easy to access CD, and CD is securely held. Cons: there is no mechanism to keep the container closed, so the booklet falls out easily.
Middle: Booklet style, two plastic inserts glued to cardboard, with a cardboard hinge. Pros: CD is held securely. The two plastic halves are able to lock. CD and booklet are secure. Cons: that cardboard hinge might tear if it is abused or gets wet. I keep my CD's very well so it still looks good.
Bottom: Booklet style, cardboard construction. Booklet integrated into cover, CD's (2 of them) held within cardboard sleeves. Pros: very compact for a case that holds 2 or more CD's. Everything is secure and nothing will fall out even if you turn it upside down and shake it. Cons: a bit difficult to remove the CD. Nothing to protect the cardboard from scuffs.