This can be a bit more expensive and time consuming, but I think the payoff in saving space (and furniture) makes it worthwhile.

I use a product called jewelsleeves (www.jewelsleeve.com)

They require about 1/4 the space of a regular jewel case.   Unlike other "sleeve" products, you can keep the back tray card and booklet intact - plus the sleeve actually removes dirt and dust from the CD. It also becomes much easier to keep things in alphabetical order - a task that is nearly impossible to maintain with heavier plastic cases.

Some people complain that you can't read the spine - but I find it to be very easy. Because it is easier to keep in alphabetical order, you simply run your finger along the shelf and find the CD.   I would bet I could locate CD's faster than most people.

As a radio host, I receive about 20 CD's a week. The jewelsleeve not only makes my job easier, it probably saved my marriage!! No more stacks of CD's falling all over the place.

If you can afford the expense, they are well worth it. You will offset the additional price because you will need far less shelf space to store your collection. The company also offers storage cabinets.