Heritage seeds and seed saving
Just a list of Aussie links for now
http://www.seedsavers.net/This group form NSW were good up until 6 months ago. You paid your memebership and twice a year they sent outlists of seeds that could be ordered from them or other members, (postage and packing costs only).
It's system is now decentralised and the list I got last spring was worse than useless. It's now better to just visit your local group and buy seed. My local(ish) group is Northey Street Farm in Brisbane.
Henry Doubleday Research Association of Australia
http://www.hdra.org.au/ Will get my membership from there next. I used to be a member of the UK organisation in the 90's. It was great, so hopefully the Aussie one has finally stepped up to replace seed savers as my longterm supplier.