Primary sources
▸ Manifesto of the Empress Catherine II issued July 22, 1763
  A further manifesto regarding settlement of foreigners.
▸ The Instructions (Nakaz) of Catherine II to the Legislative Commission of 1767
  [Translated by Nathaniel Knight, Seton Hall University]
▸ Alexander Radishchev, Journey from St. Petersburg to Moscow. 1790
  [Translated by Nathaniel Knight, Seton Hall University]
▸ Modern History Sourcebook: Catherine the Great
  [Fordham University] Excerpts from a letter of Baron de Breteuil (a French diplomat), the Nakaz and the Decree on Serfs.
▸ Le Journal de Marie Daniel Bourrée de Corberon
  (French)

 

Monographs, articles and reviews
▸ Charles Cameron, Architect to Catherine The Great, Empress of Russia, an online book
  About the Scottish neoclassical architect to Catherine II, who worked at the Russian palaces of Pavlovsk and Tsarskoe Selo. By George Lukomski, with an introduction by Bob Atchison.
▸ "Potemkin and the Panopticon: Samuel Bentham and the Architecture of Absolutism in Eighteenth Century Russia"
  [UCL Bentham Project] By Simon Werret.
▸ Vremiia Ekateriny II (1762-1796)
  (Russian) By S.F. Platonov.

 

General sources
▸ Catherine II in :: Wikipedia :: Answers.com
▸ Catherine and Pugachev
  [One of the lectures by Prof. Gerhard Rempel, Western New England College] A sketch of Catherine II's foreign policy - generally good.
▸ The Pale of Settlement (Map)
  From Beyond the Pale: The History of Jews in Russia
▸ Love and Conquest
  Personal Correspondence of Catherine the Great and Prince Grigory Potemkin (edited and translated in English): Official website for the book. It has a very useful chronology.

 

Biographical references
▸ Catherine the Great
  The Catherine the Great FAQ is worth having a look.

 

Bibliographical references
▸ Empress Catherine II "The Great" of Russia
  Annotated bibliography is very useful.
▸ Katharina II, Zarin
  [Biographisch-Bibliographisches Kirchenlexikon (German)] There are many books and articles in English listed so it is worth having a look.

 

Chronology
▸ Catherine the Great
  Good if you want to know who was Catherine's lover at a given time but otherwise covers her life from her birth to death in a sketchy manner.

 

Culture
▸ The 'Grand City' of Catherine the Great
  [Saint-Petersburg.com] Useful nuggets of information.

 

Philosophy, philosophers and the Enlightenment
▸ St Petersburg Center for the History of Ideas
  (English/Russian) The "official site of the St Petersburg Center for the History of Ideas", the main purpose of which "is to foster international scholarship and researches in the history of Russian ideas at the Age of Enlightenment."
▸ Samuel Bentham
  [Industrial Revolution Museum] A short biography of Samuel Bentham.
▸ Catherine II: lectrice de Jean-Jacques Rousseau
  (French) Une exposition réalisé au printemps 1999 par le Musée Jean-Jacques Rousseau de Montmorency . A useful sketch.
▸ Oeuvres complètes de Voltaire
  (French) Complete works of Voltaire

 

Portraits
▸ Portraits of Catherine II
  [The Hermitage] A fantastic collection with a digital gallery. The site is very clear and easy to navigate.
▸ Temple of Catherine the Great
  Portraits and a short biography.
▸ Portrait of Catherine II, Empress of Russia by Vladimir Borovikovsky
▸ Portrait of Catherine II as Legislator in the Temple of the Goddess of Justice by Dmitrii Levitskii
  [Olga's Gallery]

 

Miscellaneous
▸ The Dramatic Works of Catherine II
▸ Catherine the Great Quiz
  [Prof. Michale Petrovic, University of Wisconsin-Madison] Not to be laughed at!
▸ Reading the 5 Kopecks of Catherine the Great (1763-1796)
  [The Russian Numismatic Society]
▸ Record sum for Voltaire letters
  [BBC] 26 letters from Voltaire to Catherine II sold for $750,000 at Sotheby's.

 

Recent publications on Catherine II in English
Details are correct for the UK. The US edition may be published by another company.
▸ de Madariaga, Isabel, Catherine the Great: A Short History, New Haven - London (YUP), 2002
▸ de Madariaga, Isabel, Russia in the Age of Catherine the Great, London (Weidenfeld & Nicholson), 2002
▸ Dixon, Simon, Catherine the Great, Harlow (Longman), 2001