This article explains that days after the letter Castro allegedly wrote, Castro wrote an article saying that news of his death are ridiculous. Yet, these rumors are not ungrounded, as Castro hasn't made a public appearance since March, when Pope Benedict XVI visited Cuba.
Rumors had circulated weeks ago that Fidel Castro was dead, in a coma, or on his deathbed. A letter with his signature was released to the public more recently. It certainly feels like a stunt to suggest Castro is well when he really isn't.
Another article on the war on drugs. This article explains that the Guatemalan president suggested drug decriminalization in front of the UN General assembly, and said that it should coincide with increasing military pressure on drug violence. Legal drug use would be state controlled, much like the use of tobacco and alcohol in the United States.
Chavez is up for reelection, and the populations is inspired by his opponent, a former governor. If Chavez is defeated, this would have world-wide ramifications for the oil industry, but also make sweeping change in Venezuela. Though it could easily turn out to be the same as the recent Russian elections, plagued with fraud and a refusal to let go of power.