Cost of Afghan intervention: $443 billion and rising

Non-US donors to Afghanistan

"Through the end of FY2011, the United States has provided over $67 billion in assistance to Afghanistan since the fall of the Taliban, of which about $39 billion has been to equip and trainAfghan forces. During FY2001-FY2011, the Afghan intervention has cost about $443 billion, including all costs. For FY2012, about $16 billion in aid (including train and equip) is to be provided, in addition to about $90 billion for U.S. military operations there."
All this and more in a very informative Congressional Research Service report:  Afghanistan: Post-Taliban Governance, Security, and U.S. Policy, written by Kenneth Katzman and published last week.
Includes assessments of security policy for the next three years, detailed breakdowns of humanitarian, economic and military aid, an overview of 'the enemy', commentary on the Obama troop surge, regional relationships, residual issues and 26 very useful tables.