Are there any good references online about how to switch from Github-based collaboration to one based on email and patches? I'd like to give it a try and see how it feels.
Put mailman/majordomo and cgit/gitweb on a server, and a little front page for the project if you like. Use spamassassin with mailman, restrict allowed mail mime types to plain text and patches. Maybe use one of those tools that pick patches up from your mbox. Quilt is a good patch manager. I'd use emacs org mode for issues and todos.