Here's where questions go
I've been getting questions submitted via email, which is fine, but here is where you'd post a question for the glossary. There's an "add child page" link down at the bottom of each "book" page to add a new book page entry for our review. You have to have an account to post a page, and they're all reviewed prior to public posting.
Of course, you can also just comment on an existing page if you'd rather not throw in a whole page. The comments go up immediately, while new child pages are all reviewed.