Nigeria: Signs of decreasing corruption?

For Nigeria, a nation long considered one of the world's most unrepentantly corrupt, the last few weeks have been remarkable. First the national police chief, who had recently resigned, was arrested and led away in handcuffs, accused of graft and money laundering. Then the housing minister was fired, charged with selling government houses on the cheap to the well connected. Finally, the head of Nigeria's Senate - the third-highest-ranking official in the beleaguered West African country - resigned after being denounced by the president for bribery.