Punishments

Societies seem to be becoming more merciful and permissive in their punishments for crimes. Over a hundred countires have abolished the death penalty within the last hundred years, and even in those that do still have executions, you aren't likely to see someone quartered by horses or burned at the stake.
What punishments do you think should still be used, and under what circumstances?
Do you feel that harsh punishments are useful in deterring or preventing crime?
Should we be more concerned with saving (or making) money when considering criminal punishments, or is excess spending justified to create a more desirable outcome (Prevention, rehabilitation, accuracy, fairness, etc.)?
What punishments do you think should still be used, and under what circumstances?
Do you feel that harsh punishments are useful in deterring or preventing crime?
Should we be more concerned with saving (or making) money when considering criminal punishments, or is excess spending justified to create a more desirable outcome (Prevention, rehabilitation, accuracy, fairness, etc.)?