The Permaculture Research Institute of Australia is currently highlighting the availability of what it describes as the “excellent, growing resource” of Learn Grow on its website:
http://permaculture.org.au/2011/11/26/learn-grow-edible-plant-information-resources/
It is referring to the comprehensive edible plant list information for a number of specific regions of the world (a work-in-progress) and two plant disks – Edible Plants in Tasmania and Food Plants in Australia. The disks are available and can be purchased from this website.