Jaguar001, your first question is very pertinent. It is usually something glossed over by US and UK media and governments. The loyalty of the Pakistanis in general in the so-called 'war on terror' is highly uncertain and fluid. Sure, Pervez and high levels in the government do pay lip service to the anti-terrorist cause and occasionally serve up apparently wanted terrorists on a plate to mollify the West.
However, it's been an open secret that middle ranking officers in the Pakistani army, the intelligence agency and in civil law enforcement, especially in the provincial cities and closer to the Afghan border, supported the Taleban when they were in power and tend to support them now. Partly it is due to tribal and ethnic similarities, partly it is a matter of financial and political convenience to do so. The Pakistani government has been fairly successful at marrying these two competing demands. I am given to understand that Pakistani civil society and social stability does depend to some degree on not alienating the Muslim "street" which is very supportive of Islamism, the Taleban, al-Qaeda and OBL, especially in cities such as Lahore or Quetta.
None of this is really a secret, but one does wonder how much this was all mulled over at the higher levels of government in London and Washington.
Remember, Pakistan is a highly unstable county and potentially dangerous to Western interests. Oh, and they also have nukes.