As I asked yesterday, if killing one thing you know produces three things you don't, are you really making progress?

Mr. Zarqawi's network lost no time in vowing to carry on. And from the experience of the war so far, it seems at least an even bet that an octopus-like Qaeda network, seemingly able to grow new tentacles to replace those it loses, will continue to bedevil the Americans, fed by a generation of young Muslim men from the Middle East, North Africa and Asia who are ready to travel down the chain of mosques and safehouses that ends, often, with a suicide bombing in Iraq.