The war in Iraq cost the US 2 trillion+ dollars and helped cause the current economic crisis (a bad role model of borrowing and spending immense amounts of money).
More Americans lost their lives in Iraq then due to all Al Qaeda terrorist activities combined.
The goodwill the rest of the world had toward the US after 9/11 and prior to the Iraq war reversed itself in disgust as a direct result of the Iraq war.
This one small act of defiance, resonates not just in Iraq but across the world.
Read more in the NY Times at: Iraqi Journalist Hurls Shoes at Bush and Denounces Him on TV as a ‘Dog’