As usual on Ellie Crystals site - good introduction to the subject with images and links to latest developments. Czech Crop Circle Web Site Czech Crop Circles. Linda Moulton Howe's site has many excellent articles on crop circles. FGK - Forschungsgesellschaft Kornkreise e. The site of the German Association for Crop Circle Research.
Most articles have an English translation.
Findon Village Antiquities - Crop Circles Information about the crop circles that occurred close to the village of Findon, West Sussex, England. Crop Circle Information A beautiful Crop Circle site with articles, geometry research, artwork and animations. Run by Martin Keitel. You can find articles and a few circle analysis. An independent community for the exploration of the crop circle phenomenon.