A rack for storing CDs. They come in many different shapes and sizes:

Flip rack
Small tabletop variety that usually holds around 20 discs. The discs stand upright in the rack, and you have to flip through them to find the CD you want. Usually made of plastic, but sometimes of wood.

Tall and skinny rack
These racks come in different forms: Short and wide rack
I think these racks the best. I find they fit the most CDs in the least amount of space and are easy to search through.

Oddball
http://www.furnitureontheweb.com/images/products/p_et/1650.jpg


Sorting Your Rack

If you like to sort your rack alphabetically or whatever, it can be fun adding new CDs to the sorting scheme. Y'know.. just sitting moving the CDs one-by-one to make room for the new one.