The Fan Museum at Greenwich, the world's first museum devoted entirely to fans.
The Fan Circle International publish a quarterly Bulletin, and membership details can be found here
Cynthia Fendel publishes a monthly fan newsletter "Hand Fan Spam" via the web, so find her site here
The French collection, a very large site at Place de Evantail
An Italian site, with a very large and interesting colletion of Anna Checcoli here
The International Fan Collector's Guild have a huge site, dedicated to all aspects of fans and resources.