President Bush denies any intention of invading Iran, but he's been warning about its activities in Iraq and its growing influence in the Middle East. After years of enmity, what's the state of relations between Iran and Iraq? With America's military build-up in the Persian Gulf, could the proxy war with Iran turn into the real thing? Plus, the commander of US forces in the Middle East says it's time to redefine goals in Iraq.  On Reporter's Notebook, regulators say nuclear power plants don't need additional protection against 9/11-type attacks from the air.