Plenty of editors and site admins maintain an editorial schedule to stay on track. The Posts To-Do List WordPress Plugin can also help. It lets you tell your writers what post they should write. You will be able to share notes, keywords, and other relevant info for each post.
Posts To-Do List also lets you keep track of the stats for your posts, showing you how many posts were added to the list and done. You can also pick and choose who can add new posts and delete them. The plugin is Ajaxified, so page reloads are not necessary.
Thanks to this plugin, your writers and editors can collaborate without having to deal with too many e-mails. It is available as a free download.