Kil'n People, David Brin
Live-for-a-day clones do the work while archies persue hobbies. Real people's only job is to keep their body in shape. It all balances out when the clone's memories are transfered back at the end of the day. If only the world were that simple: clones are a new underclass, they're customised for different jobs, they're stolen and copied illegally. A detective thriller set against a background of future technology. A lot of interesting ideas, thought through, that got confusing at the end.
