We won't dive back into all the backstory that led to former AMD CEO Hector Ruiz's current troubles as the chairman of AMD spin-off Globalfoundries, but let's just say that when your name is in the same sentence as "insider trading scandal" and "hedge fund probe," you're probably in a pretty bad way. While this story is obviously still far from over, it looks like Ruiz has at least realized the gravity of his predicament, and announced today that he's taking a "voluntary leave of absence" before formally resigning from the company on January 4th, 2010. He'll be replaced immediately by former Broadcom CEO Alan "Lanny" Ross, who will serve as interim chairman until the company's board appoints a permanent chairman.