O-Zone: The Ornithopter Society  
   Fly with flapping wings. Features information on getting started, photo and multimedia gallery, free plans, resources, links, newsletter and discussion forum.
   http://indev.hypermart.net/

Project Ornithopter  
   An engine-powered piloted aircraft, which is based on the technology of the Harris/DeLaurier model. Features history of ornithopters and the project, media gallery, links and contacts.
   http://www.ornithopter.net/

Birdman of Lincolnshire  
   Alan Stewart explores ornithopters emulating the natural flight of birds and insects. Features overview, photo gallery, archives and research information.
   http://members.aol.com/clipcom/birdman.htm

Yahoo! Group: FlapnFly  
   Discussion forum of ornithopter aircraft and their discussion, test and operation. Featured postings include online newsletter of The Ornithopter Society.
   http://groups.yahoo.com/group/FlapnFly/