Don't know how reliable this info is but according to this source:
Pope Benedict, Joseph Ratzinger, has scheduled a meeting with Italian President Giorgio Napolitano for Saturday, February 23 to discuss securing protection and immunity from prosecution from the Italian government, according to Italian media sources.http://itccs.org/
Ratzinger's meeting follows upon the apparent receipt by the Vatican of a diplomatic note from an undisclosed European government on February 4, stating its intention to issue an arrest warrant for Ratzinger, who resigned from his pontificate less than a week later.
If it's true, might be not only why the Pope resigned but also why he's going into "seclusion" within a refurbished cloistered monastery inside the Vatican. IANAL, but wouldn't the Vatican be able to refuse to extradite him since they're a kind of sovereign nation?
Didn't see other diaries on this when I did a search and I really don't know anything about the source or whether it's all fabricated. Anyone out there who knows more?
(If it's junk, I'll delete the diary).