The European Union
Europa (EU Commission official service, with legislation, regulations, cases, press releases.)
European Commission Directorates
European Union Basics (FAQ) by Roland Siebelink
European Integration Online Papers - peer reviewed working papers on European Integration from the European Community Studies Association (ECSA) Austria
Maastricht Treaty on European Union (in English)
European Union Internet Resources (UC Berkeley Library)
The EU employers' Network - developments in European social & employment law
The Jean Monnet Program at Harvard Law School
EURODICATOM (polyglot dictionary of EU legislation)