I am interested in creating a list of resources with high quality information related to the [projects I am working on].
If possible I will create an RSS feed so we can all easily stay up to date.
SuperMemo Guru: The current best source I know of for spaced repetition articles.
I stumbled across his goldmine of a Wiki while randomly researching incremental reading addons for Anki. Most of his articles discuss using spaced repetition to learn math.
He has written quite extensively on topics related to spaced repetition on his blog.
He also has a public Zettlekasten system with some interesting notes on spaced repetition.
I found him through Issa Rice's List of people who have thought a lot about spaced repetition.
[Andy Matuschak] shares his working notes, many of which are related to spaced repetition.