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Tresor De La Langue Francaise,
Incredible dictionary - very high level - suitable for teachers or highly advanced students - has in-depth definitions with usage examples of the French language.
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Academie Francaise
The official site of the Academie Francaise. Provides information on its role, its history, its members (called "les immortels"), its influence on the French language, and its dictionaries (actual limited online access).
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L'anglais Des Affaires : Business English Glossary
Businsess terminology - English/French or French/English listing of terms relating to business, banking, buying, selling etc. Very easy to use - has some phrases e.g. "cancel an order" = "annuler une commande".