I agree with Mike that we should just start with a blog, “since that’s the method all parties seem familiar with.” If you would like to participate in a group blog on sharing teaching resources and creating resources collaboratively, email me at ghw[at]wordherders[dot]net with a username and password. I’ll add you to the list of authors on a blog I’ve set up.
[In case you’re just joining us, dear reader, here are my first post and second post on the subject.]