Encyclopedias
My Garden Pal
[ http://www.mygardenpal.com/ ]
Find the right plants for your garden planner with plant and gardening index and garden software.
New World Encyclopedia
[ http://www.newworldencyclopedia.org ]
Organizes human knowledge in a way that allow a reader to learn information, not just for its own sake, but for its value to the world as a whole.