I’ve seen a couple of different versions. Here’s the “real” one, from Salon.com, where it seems to have been initially published (and, ahem, copyrighted).
Ansary makes some very good points about what is at stake in any “war” against Afghanistan and the Taliban, what might be necessary, and whether that’s not exactly what bin Laden wants. It’s not easy reading, because it flies in the face of what so many people want to believe and do — and, in the end, might have to do, regardless, since there aren’t a lot of alternatives — but it’s reading that has to be done.