I would recommend reading the following articles. The articles #2 and 3 has a lot that one needs to know about the real situation in the tribal areas of Pakistan.
I believe the unilateral truce that Osama is offering
is just because mercenaries want to reorganize themselves and hold a firm ground in tribal areas of Pakistan.
"You can draw the Afghan-Pakistan border on a map by looking at the pattern of signal intercepts," says one U.S. official. "The bad guys chatter away in Pakistan, feeling they are safe. That area lights up like a Christmas tree. Then they go silent when they cross into Afghanistan, where they fear getting hit."