Soft Paws Nail Caps for Cats and Kittens:
Something look a little odd with this picture? That's because the cat is wearing Soft Paws— caps that fit over the nails and held prevent damage to furniture when the cat scratches. Supposedly it's easy to use. "The application is simple. Just fill each nail cap with the adhesive provided and slide it on over the nail. It's that easy!" (They obviously have never met Artemis, who howls whenever we try to hold him. And that brings Lexie, who sort of believes she's his mom, over to try to rescue him.)
It's definitely a humane alternative to declawing if it works. And it would mean we could actually get a new couch without living in fear.