The ability to schedule email messages; or, if you wanna take it further, basic email tracking (read receipt) and scheduling.
I'd love to have the option to schedule my messages. Read receipts isn't a bad idea either. Some basic Yesware style functionaly would be welcome.
Jason Epel commented
Does this cover the following use case? Deferring a sent message for _ days and having an alert when it triggers, unless its read receipt or response has been received.
I agree, Yesware would bring my whole Gmail setup to the desktop
I would love for Ali's idea to be implemented as well - The ability to have all emails come through at a scheduled time each day e.g. 11:00am as opposed to them being pushed through automatically.