Findlaw - Looting, Rumsfeld concluded "isn't something that someone allows or doesn't allow. It's something that happens." 

Independent - Robert Fisk reports that library books, letters and priceless documents were set ablaze in final chapter of the sacking of Baghdad. 

"So yesterday was the burning of books. First came the looters, then the arsonists. It was the final chapter in the sacking of Baghdad. The National Library and Archives ­ a priceless treasure of Ottoman historical documents, including the old royal archives of Iraq ­ were turned to ashes in 3,000 degrees of heat. Then the library of Korans at the Ministry of Religious Endowment was set ablaze."

Washington Post - Some Iraqis, however, question the allocation of U.S. forces around the capital. They note a whole company of Marines, along with at least a half-dozen amphibious assault vehicles, has been assigned to guard the Oil Ministry, while many other ministries -- including trade, information, planning, health and education -- remain unprotected.

"Why just the oil ministry?" Jaf asked. "Is it because they just want our oil?"

The 2003 Iraq War & Archaeology - Exhaustive collection of links on this topic.

Update:

Looters Stole 6,000 Artifacts (06/21/2003)