The situation in Pakistan is a very rough one. I've written something at Strategypage, but we need to talk the options.
Now, we hear that President Bush may be reassessing the relationship with Musharraf. We do need to assess the situation, but we have something else to think about: Over 40,000 coalition troops who we need to supply - from us and thirteen allies. Fourteen if you count Afghanistan and the 50,000-plus personnel there.
Musharraf is friendly, and he is rational. Given that Pakistan has nearly 100 nukes, we need to keep him in as long as possible, until we have a better idea who will succeed him. But right now, things are risky.