Human Development Report (UNDP)
A reliable source and alternative perspective on critical issues for Human Development worldwide.
http://hdr.undp.org/

Food and Agriculture Organisation of the United Nations - FAOSTAT
Over 3 million time-series and cross sectional data relating to food and agriculture.
http://faostat.fao.org/

United Nations Statistics Division - National Accounts Official Country Data
Official national accounts statistics in national currencies as provided by the National Statistical Offices.
http://unstats.un.org/

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/