The following websites are useful for researchers on issues of European integration and governance:

Current Events

EU Observer
Agence Europe

Official Sites for EU Documents, Statistics and Archivesof Major European Organisations

General EU 
     European Commission 
     European Parliament 
     Council of the European Union
EUR-Lex (official gateway to EU law and treaties)
Eurostat (Statistical Office of the European Union)
Historical Archives of the European Union (Florence)