I respect the plant breeding work of Carol Deppe. She offers seeds via Fertile Valley Seeds. From her bio, "Oregon plant breeder and author Carol Deppe holds a PhD in Genetics from Harvard University and specializes in developing open source crops for organic growing conditions, sustainable agriculture, and human survival for the next thousand years."
I especially enjoyed her line of Oregon Sweetmeat Squash, and this year I am excited to try some of her flour corn as well.