For the most part, the only slot in the car which is jewel case friendly is the one in the dash, unless you have the aftermarket/port option 6-disc player installed, and then there is basically no place to put CD cases. Not exactly the best design item. Sure, I suppose you could put them in the door pockets, but that is a place where the cases will scratch up the door pockets, and rattle and shake.

It has been said:
Hybrid drivers come in 3 flavors, greenie, techie and cheapie. Pick any 2.
2005 Prius, Melinium Silver over gray, package 5 (AI)