I was listening to the radio and heard an interview with someone called Richard Louv. He was talking about how children living in western cities have lost the ability to interact with nature in an unstructured way. He has written a book called Last Child in the Woods on how we can help kids get back outside. I'm interested in finding a copy of it to read.
I feel as a society that we have become so disconnected from the natural world, it's so important for us to help children to spend time in it. It reminded me of a type of preschool I heard about in Europe called Forest kindergartens. The kids spend all day in the forest; building, exporing, playing in nature. Sounds like a dream preschool to me :).
(I find it interesting that so many of these preschools seem to be in Europe - when our climate makes it perfect for an outdoor life style. Aside from the hottest hours of the day in summer we have a great climate for an outdoor preschool)