Some good points from a slightly credulous site .
I find it odd, to say the least, that people refuse to accept that crop circles could be man made because of their complexity but are happy to accept that it could be the work of aliens. http://www.circlemakers.org supply some useful 'insider' information on their web site including how long it took to make some of their crop circles. One formation made for The Daily Mail was 300 feet across and made in 4.5 hours. Another was 200 feet across and made by three people in 2.5 hours, and yet another was 218 feet across made in just 2 hours by only two people. It is also interesting to note that Circle Makers say that it is easy to see that crop circles are man made because of prominent construction lines that underlie the paths of flattened crop that circlemakers use to lay out the geometry of the design.
So, to sum up, what do we have?
1) We know crop circles first appeared in the UK following that silly Australia Saucer Nest story of 1966. 2) We know that crop circles were started in the UK by two pranksters, basing their idea on the Australia Saucer Nest story of 1966. 3) We know crop circle started with simple circles and gradually, with practice, progressed to more complex geometric shapes. 4) We know we have Circle Makers who regularly make crop circles. 5) We know it is a simple matter to make large, very complex circles in a few hours under cover of darkness. 6) We know that man made construction lines can be found under the circles.