Cheap, safe, easy CD rack idea:

Hang them on nails or thumb-tacks

This method has many advantages:

• By hanging vertically, they don't collect dust
• You can sort related CDs on the same nail, without scratching them all up
• By facing the label out, you can find what you want easily
• You can eliminate all those space-consuming Jewel Cases

I started doing this at my job, and it's worked out great...no more stacks of cases and envelopes to sort through, and we can find what we are looking for pretty fast.