Picture posting is enabled for all :)
In earlier times, before we had diaries etc, the gardening calendar was linked to the religious one (thinking Christian - Saints Days etc), so that as the various days approached, rural people knew what had to be done during that period. I know this is still a practice across parts of Europe, and presumably applies to faiths other than Christian as well.
I agree Easter is a handy mental milestone, and there may also be more to it than meets the eye. Can it be complete coincidence that the 2006 growing season seems to be slow to start, and Easter is late? ::)
I will be planting a minimum of 9 rows of 6 metres each, sowed as thinly as I can manage.