If you are concerned about your cat scratching your furniture, there is a wonderful product called "softpaws", which can be found at www.softpaws.com
This is similar to artificial nails for a human, in that they are soft plastic covers for your cat's claws that are relatively easy to apply. I know a number of kitty owners who have used them and rave! The cat feels no discomfort (aside from getting the things on in the first place), and it saves your furniture.

As far as declawing a cat, all I have to do is think of how I would appreciate having my fingernails removed. Not only is it painful for the cat, but what if your indoor kitty accidentally gets out one day and cannot defend itself against a predator?

I am definitely against declawing cats. There is always another way to solve the problem.