"When Pope Celestine V quit his job in 1294, his successor locked him in prison and kept him there until he died."

"Pope Benedict XVI will not suffer the same sad fate. When he resigns today, not only will he not be jailed, exiled or even sent to a retirement home, he will get to stay in the Vatican."

This worries some Catholics who think having two popes in the house will make things a little crowded. Some even fear there is a nefarious scheme at work that will allow Benedict to exert undue influence on his successor.

Good luck working out the ex-Pope logistics. 

ADDED: "He has no intention of interfering in the position or the decisions or the activity of his successor. But as every member of the church, he says fully that he recognizes the authority of the supreme pastor of the church who will be elected to succeed him."