Just read a rather delightful paper on the topic by Fr. Heath Curtis located here: Apostolic Succession
Do read Eric Phillips insightful comments following it as well. Fr. Curtis' paper reminded me of story told by Fr. Mark Buetow. He was attending some clergy gathering on a campus and wore his pectoral cross. An Episcopal or Roman priest (can't remember which) said: "In my tradition, that is worn only by a bishop." Without missing a beat, Mark responded: "In my tradition, I AM a bishop." Bingo.