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.
I'm a lumberjack and I'm okay, I sleep all night and work all day. Tiny lumberjack ad:
World Domination Gardening 3-DVD set. Gardening with an excavator. richsoil.com/wdg