This awesome Gmail plugin I'm using helps me to...
1. Write messages now and schedule them to deliver at any time
2. Schedule messages to return to my inbox at a later time so that I don't forget to take action on them
3. Remind myself to follow up on messages that don't get a response within a specified amount of time
I love it and think you might too.
To find out more and sign up for a free account to test it out visit http://bbrshow.com/boomerang