This stock market thing reminds me of that newer Bond movie that came out a few months ago..
As far as another large scale attack, I may be naive, or stupid, but I don't think we'll have another giant attack on the scale of 9-11... I think it'll come as something simple like gunmen in malls or schools.... or heck even suicide/car bombers....
But I suppose if we learned anything from these camel-humpers it's never underestimate them..