Perennial plants are the answer to restoring eco-systems and feeding people! Here is a database that is a useful resource for permaculturalists, homesteaders & edible landscape designers.
You should never forget that every creature has its purpose in the cycle of nature and can also be very important to humans. Sepp Holzer's Permaculture
i use pfaf.org a lot, huge list of perennials and how to eat them. has been super helpful, but always second search the stuff you are interested in because some on their info is a little copy/pasted.
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a new overhaul of the freeheat page - need feedbacks for world domination