This document provides historical statistics on population and GDP for countries and regions around the world from 1 AD to 2003 AD. It summarizes revisions made to the data since it was originally published in 2003. Key updates include filling gaps in 1 AD population estimates for the Roman Empire, revising GDP for several countries from 1991-2003 using new sources, and updating population estimates for most countries from 1950-2008 and projections to 2030 from a US Census source.