Anyone who has recently bought a new Kindle should look at Kindle 3 covers to protect their device. They are available in a variety of colors and with a variety of accessories that will make your device all you want it to be. If everyone in your house has a Kindle, different covers will keep you from grabbing the wrong one as you head out the door.
The first consideration is how much protection it will give your reader. There is always the risk of dropping it, hitting it against something or crushing it when it is in your carrying bag. Do not get something that only covers the screen, you need full protection for the whole thing.
Since you need a cover for protection, get one that can be used as a stand too. Now you can lay on the floor or couch and prop up your reader. It is also useful for when you are reading but your hands are busy elsewhere.
Another popular option is a cover with a light. The light works off the Kindle battery. This will enable you to read in dark rooms