I thought this was "The Onion," or some other satire-rich medium, but it looks like the real deal.
I did check to see if today was April 1.
http://news.yahoo.com/pope-resigns-saying-no-longer-strength-fulfill-ministry-112923467.html
I did check to see if today was April 1.
http://news.yahoo.com/pope-resigns-saying-no-longer-strength-fulfill-ministry-112923467.html