MEXICO CITY - Former Mexican President Vicente Fox is writing a memoir that will detail his ups and down with world leaders around the globe, from Cuba's Fidel Castro to President Bush, Viking announced Wednesday. Viking, an imprint of Penguin Group USA, will publish "Revolution of Hope" in October. The book will be co-written by Fox and his close friend, public relations consultant Rob Allyn, who spent much of December and January working with Fox at his ranch in central Mexico. "The president's goal is to share his views about issues like immigration, the war in Iraq, globalism, free trade...