From the HuffPo writeup:
McClatchy reports that the man who hurled his shoes at Bush during his press conference was an Iraqi journalist. CNN notes that this is considered an insult among Muslims:
An Iraqi television journalist hurled two shoes at President Bush on Sunday during a joint news conference Bush was holding with Iraqi Prime Minister Nouri al Maliki to mark the signing of a U.S.-Iraq security agreement.
Bush had just finished his prepared remarks in which he said the security agreement was made possible by the U.S. surge of troops earlier this year, whhen the journalist, Muthathar al Zaidi pulled his shoes off and hurled them at the president. "This is a goodbye kiss, you dog," Zaidi shouted.
Bush dodged the shoes and was not struck. Bodyguards quickly wrestled Zaidi to the floor and hauled him, kicking and screaming, from the room. Two other Iraqi journalists were briefly detained after one of them called Zaidi's actions "courageous."
Maliki tried to confiscate all the video tape of the incident..the American government personnel intervened and all journalists were allowed to keep their video. As WaPo notes, tossing ones shoes at someone is the most extreme form of 'dissing':
Zaidi was seated in the second row of seats, about 12 feet from Bush's lectern. Zaidi, colleagues said, was kidnapped by Shiite militiamen last year and was later released. Throwing a shoe at someone is considered the worst possible insult in Iraq, and is meant to show extreme disrespect and hatred towards someone.
As the BBC notes:
With his second shoe, which the president also managed to dodge, Mr Zaidi said: "This is for the widows and orphans and all those killed in Iraq."
Bush is on his way to Afghanistan, wonder what treats await him there, ya know? ;)