Wikimedia
Wikipedia: War of the Spanish Succession
Wikipedia gives a great account of the War of the Spanish Succession, with links to related information. The article discusses the origins, the progression of the war, the Peace of Utrecht, as well as the participants and major generals.
Other
University of Potsdam: Museum of the Thirty Years' War
Short tour of the Museum of the Thirty Years' War. The discussion guides you through the seven floors of the museum with a description of the reason why that particular part of the war is important.