I) European Union institutions:
The gateway to the European Union provides links to all EU institutions: http://europa.eu.int/
Council of the European Union: http://ue.eu.int/cms3_fo/showPage.ASP?lang=en
Presidency website: http://ue.eu.int/showPage.asp?id=695&lang=en&mode=g
European Commission: http://europa.eu.int/comm/index_en.htm
European Commission office in the United Kingdom: http://www.cec.org.uk/
European Parliament: http://www.europarl.europa.eu/
European Parliament office in the United Kingdom: http://www.europarl.org.uk/
European Court of Justice: http://curia.europa.eu/jcms/jcms/Jo1_6308/
European Court of Auditors: http://eca.europa.eu/portal/page/portal/eca_main_pages/home
European Ombudsman: http://www.ombudsman.europa.eu/home/en/default.htm
European Central Bank: http://www.ecb.int/ecb/html/index.de.html
II) EU Documents:
Office for Official Publications of the European Communities: http://publications.europa.eu/index_en.htm
EU laws: http://eur-lex.europa.eu/en/index.htm
Statistical data on the EU: http://epp.eurostat.ec.europa.eu/portal/page?_pageid=1090,30070682,1090_33076576&_dad=portal&_schema=PORTAL
III) Other useful websites:
European Sources Online: http://www.europeansources.info/initial.jsp?sib=Athens
Eurobarometer: http://europa.eu.int/comm/public_opinion/index.htm
European Consortium of Political Research (ECPR) http://www.essex.ac.uk/ecpr/
A Jean Monnet Centre of Excellence Co-Funded by the European Commission