Andrew Pyrka's website Cropcircle Wisdom. He is of the "Crop Circles are made by people but weird things happen in and around them" camp.
An interview with Andrew Pyrka
Invisible UFO filmed in crop circle at Barbury Castle formation.
Thanks for that, very interesting footage
his POV matches mine
Question: Are all crop circles man made ?
Answer: 99% - Yes, but ! Because there are one or two crop circles which do not display the usual man made attributes so we have reserve a small percentage to allow the benefit of the doubt.
Question: If crop circles are man made, has this changed your views about the phenomenon and will you continue to research further ?
Answer: Yes - my views have changed but due to profound experiences and entity sightings, my research will indeed continue at a more intense scale than before as I believe that there are forces at work which influence man in what he does. We will therefore conduct various experiments in 2011 ( so watch this space )