Pretty self explanatory: Unsubscribe From Daily Email Deals
Schedule email to be sent later with Boomerang for Gmail
Create email, snooze and calendar reminders with Followup.cc
Also has Calendar and SalesForce integration capability.
The one that will undoubtedly rock your email accounts: Fluent
Be sure to watch their intro video.
Let me know if you try any of them and what you think!