Crop circle symbols can be easily interpreted using Biblical symbols, the book of Revelation in particular. A few chapters of the book are free on the web site.
Skeptical crop circle article.
In 1992, PSI TECH was hired to examine function/purpose, and mechanics of the Crop circle production.
This site takes a refreshingly irreverent look at the crop circle phenomenon.
The Mythologist is a film about crop circle / ufo researcher Armen Victorian aka Henry Azadehdel.
Crop circles related art work.
An online booklet (written in Flash) explaining why real crop circles cannot be hoaxed.
Information about a graphic novel that will incorporate the crop circle phenomenon.
Games and books created by mystic merlin.
An explanation of crop circles: they are prophecies of Book of Revelation events. The Bible Code in English looks at crop circles.