From Numeralist:

The Bush administration will request about $80 billion more for this year’s costs of fighting wars in Iraq and Afghanistan. The request would push the total so far for those wars and for U.S. efforts against terrorism elsewhere in the world to more than $280 billion since 9/11. That would be nearly half the $613 billion the United States spent for WWI or the $623 billion for the Vietnam War. (All costs in 2005 dollars)

And the Pentagon plans to maintain current troop levels in Iraq at least through the end of 2006:

The Army’s current plan is to keep about 120,000 soldiers in Iraq through 2006, roughly the same number that are fighting there now, a senior operations officer said Monday.