@Pippinwhite -- I'm with you. Crop circles are obviously planned and man-made. They're too regular and too decorative to be anything else. And I laughed at your aliens comment. Really, why would a bunch of aliens fly a zillion light years to earth, just to draw circles in the corn patches? Doesn't make any sense, and if they did, then they're not a bit more mentally evolved than we are.
I don't completely discount the possibility of aliens out there somewhere, or even that they've visited here. I just think they have more important tasks. You know, anal probes and all.