United Nations Population Division - World Population Prospects
Estimates and projections for every country in the world, including estimates and projections of 28 demographic indicators.
http://esa.un.org/

World Health Organization - WHO
National statistics for 50 core indicators on mortality, morbidity, risk factors, service coverage, and health systems, data on chronic diseases and their risk factors for all WHO Member States, as well as statistics for infectious diseases at country, regional, and global levels.
http://www.who.int/

United Nations Statistics Division - Millennium Development Goals
Official data, definitions, methodologies and sources to measure progress towards the Millennium Development Goals.
http://unstats.un.org/

United Nations Statistics Division - Demographic Yearbook
Statistics on population size and composition, births, deaths, marriage and divorce.
http://unstats.un.org/

United Nations Statistics Division - Gender Info 2007
Gender Info 2007 presents gender statistics and indicators on a wide range of policy areas.
http://www.devinfo.info/

United Nations Children's Fund - UNICEF
The State of the World’s Children 2008 assesses the state of child survival and primary health care for mothers, newborns and children today.
http://www.unicef.org/