We’ve just come across this fantastically detailed guide to seed saving thanks to the Seed Ambassadors: A Guide to Seed Saving, Seed Stewardship & Seed Sovereignty.
Their document (created in 2010 and as relevant as ever!) is creative commons because this should be in everyones hands.. the exact opposite of the approach of the GM companies like Monsanto and Syngenta!
We hope you find it useful and please share anything else you come across like this. We’d love to be able to post more useful resources like this.