You'll need to be a member of the board to use it however, so please post your Trello username/profile as a comment or add it to the list in my answer. If you don't have a Trello account but are interested in participating in the blog at all, please Sign up for Trello and let me know your user name/profile link. Signing up is very easy, just give your name/email/password or Google account to sign up.
Here's an example of a working blog Trello Board from Programmers.SE:
We'll be using the board to brainstorm ideas, vote on them and track their progress all the way to the point of review (when we'll probably use a Google Document for collaborative editing) and publishing.