What Did Pakistan Know?

Obviously they knew something, probably everything concerning the whereabouts of Osama bin Laden and said nothing. Odd, yet not surprising, coming from a supposed "ally"of the West on the War on Terror.

So, what did Pakistan know about the location of bin Laden, considering that he was in the heart of Pakistan for months if not years? Someone will really have to think everyone else are total sheep if they think anyone will believe that the Pakistan government didn't know that the world's most notorious terrorist was hiding in a mansion in the heart of one of their major cities.