Add notes to the "edit post" and "edit page" sidebars. Collaborators can also share notes on the WordPress dashboard.
Add notes on the "edit post" and "edit page" screens' sidebars in WordPress 2.8 and up. When used with Peter's Collaboration E-mails 1.2 and up, the notes are sent along with the e-mails in the collaboration workflow. There is also a general and private notes system on the dashboard.
On its own, this plugin adds a panel to the sidebar of the add and edit post / page screens so that users can add notes for themselves or others and keep track of these notes. Whenever you save a post, you can type a note to be displayed along with the post in the edit view.
On the dashboard, there's also a summary of the most recent notes. By default this shows notes by all people on relevant posts / pages. There is also a general and private notes system.