So here’s an extremely clever, free, and useful service. Sending an email to someone that requires a response? You can CC or BCC [email protected] and you or both of you will get a reminder about the email. Very smart, and apparently very easy to use.
I often use Things to keep track of my follow-up needed email conversations, but FollowUpThen looks like a much more streamlined way to handle those. (Via swissmiss.)