U.N. Statistics Division

This section of the U.N. collects various statistical information. It is broadly broken down into the following areas:

Classifications Registry
This section keeps information on statistical classifications.
Demographic and Social Statistics Databases
This includes their demographic yearbook and related demographic and social indicators.
Monthly Bulletin of Statistics Online
This section provides updated data.
UN Common Database
8 million data elements
Commodity and Trade Database
query for trade flows between countries
Millenium Indicators Database
National Accounts Main Aggregates Database
annual data of many countries's basic national income and product accounts
They also offer newsletters on these and other offerings.