From Slate:

USA Today leads with word that the war on terror, focused mainly in Afghanistan and Iraq, will likely cost more than the war in Vietnam, which would make it the most expensive conflict since World War II. Congress has already approved $70 billion for the 2007 fiscal year and the Pentagon is currently considering asking for anywhere from $127 billion to $160 billion more. So far, Congress has approved $502 billion for the war on terror. Notably, USAT reminds its readers that in 2003, the Bush administration estimated the Iraq war would cost $50 billion to $60 billion.