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Link: http://howto.wired.com/wiki/Build_a_Green_Roof
I've always liked the idea of a lawn or garden on top of a house, partially as insulator, but also as an interesting visual. I'd hate to try to maintain it and it wouldn't be much fun to try to maintain the structure under it either.
That said, Wired has put together one of their How-To wikis on this.