EUR-Lex - This provides free public access to European Union law. It contains the full text of consolidated treaties and all legislation in force. It also has the full text of all the Official Journal C and L series for the last 45 days.
PreLex - This site allows you to trace the progress of EU legislative proposals and initiatives.
Summaries of EU Legislation - This is a summary of the main legislative measures and procedures for each of the activities of the European Union.
Court of Justice of the European Union (CURIA) - This provides the full text of proceedings of the Court of Justice and Court of First Instance and Staff Cases from June 1997 onwards, as well as press releases of important decisions.