Watched Threads Digest - Remind your users about their unread watched threads via email
Send your members emails notifying them of their unread watched threads. This can be a good way to get them back to the site and engaging in threads they've forgotten about.
The cron that sends the email is registered as a cron entry under the "Tools" -> "Cron Entries" page. This allows you to pick when the email will be sent. It's defaulted to the first of every month but...