Some of the best ...
http://www.5thworld.net/HTML/LR_Pc.htm

http://pages.unisonfree.net/gburnett/Perma/

http://hub.dataline.net.au/~gardnlen/

http://www.ibiblio.org/permaculture-online/

http://pages.unisonfree.net/gburnett/Forest/index.html

Fireraven9
"Don't go to a doctor whose office plants have died." - Erma Bombeck

A variation on permaculture. Very information-rich site!

Here is a link that might be useful: Seedballs!

Check out our website for Permaculture. We have a Permaculture forum that is free for anyone to use.

Here is a link that might be useful: La'akea Gardens

hi .... i have been reading , but not yet posting here...
i have noticed many people asking about native plants , and what they might be used for....this is a link to a native american ethno botany database.... if you know the name of the plant , or what you want to use it for , or what tribes may have used it , this is a great tool.....i played with it a bit , it turns out most of the 'weeds' in my yard are actually food =]

not really a pc site , but i think you folks might find it useful =]
JoR

Here is a link that might be useful: native american ethnobotany database