I'm surprised they haven't already been putting sticks of dynamite or plain old using an axe to knock down utility poles in the countryside.. it's little things like that on a constant basis with no way to see it coming that will scare the hell out of this country but I have a feeling they are laying low in anticipation of something big to come.. the focus to switch... maybe they are waiting for the Iraq war to start. Who knows.. but the little tit for tat thing to keep the FBI looking for a few dozen or hundred guys killing people on golf courses is going to pave the way for a team of 5 to do something very big and very bad somewhere.
During Gulf War I and after it there were many Iraqi-sponsored attacks on targets all over the world.
You can bet that we'll see a lot of such attacks here in the US this time, because we'll be playing for keeps.