Jukka Tervamaki                                                      Excellent page, home of the JT-5B.  THE most elegant Gyro in existance.
John Price and his UK Wobbly Flyer                         Practical approach to building. Site now dormant unfortunately.
British Rotorcraft Association                                    The name says it all.
Popular Rotorcraft Association                                   American Rotorcraft site.

Custom SpeedParts                                                     German VW parts supplier. Site all in German but good prices
Reichert Tuning                                                   .....Another German VW parts supplier. In English this time
CNC Hot-Wire Foam Cutting                                   Very interesting.
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