If I were made Dictator-For-Life tomorrow, here's how I'd handle the death penalty.
First, everyone currently on death row that was convicted without the use of DNA, or who didn't confess in a clearly non-coerced confession, would have their sentences commuted to life without parole.
Next, I'd only allow the death penalty in future cases where DNA evidence or an honest confession were in place.
Death penalty cases would be limited to capital murder (actually committing the crime - an accessory who didn't actually pull the trigger would only get life w/o), child sexual abuse, and impeding the left lane on a multi-lane highway. OK not really the last one - life without parole would suffice for it. I might also add prosecutors that fight against new trials for people they have convicted in the face of new compelling evidence, especially when they do it simply to make sure their resumes stand intact.
Like others I'm bothered by the fact that we've executed so many innocent people. The only way it's acceptable to execute someone is if we know for certain that person is guilty. With forensic science the way it is today I think we can get to that point in some cases. If not, stop executing people until we can.