http://www.nytimes.com/2009/08/08/world/asia/08pstan.html
"Wednesday’s strike, according to American and Pakistani officials, was the result of steady intelligence-sharing between the countries’ intelligence services. The cooperation improved around the time of a secret visit to Washington in April by Lt. Gen. Ahmed Shuja Pasha, the chief of Pakistan’s Inter-Services Intelligence, to meet his C.I.A. counterpart, Leon E. Panetta.
At the meeting, the two sides agreed, among other things, to focus attention on striking the Mehsud network, the officials said.
The accuracy of American drone strikes against the Mehsud network improved soon afterward: the result of information gleaned by Pakistani intelligence operatives using informants inside the network, communications intercepts, and satellite imagery shared by the American and Pakistani intelligence services, according to the officials."
Steve