Boomerang is a productivity tool that can be used by Gmal users. By procuring and installing the provided Firefox/Chrome extension they will be allowed both to schedule emails to be sent later, and to receive emails acting as reminders when the time to do something comes.
Using Boomerang is dead simple. All you have to do is to compose your message as you would always do, and when you are done click on the Send Later button that becomes available the minute the extension has been installed. A calendar will be displayed when clicking on that button for you to schedule the delivery of your message. Alternatively, the delivery can be arranged by typing the date down in the provided box – Boomerang can understand natural language.
Moreover, if the message you are sending out mentions a future date then you can have Boomerang return the message to you as an auto-reminder. For example, if you email someone about a meeting that will take place the next Monday at 5 PM then you can have Boomerang resend that message to you when that day comes a couple of hours before the meeting begins, so that you are not forgetting about it.
BoomerangGmail.com In Their Own Words
Boomerang for Gmail is a Firefox/Chrome plugin that lets you take control of when you send and receive email messages.
Why BoomerangGmail.com It Might Be A Killer
It is a great productivity tool – I specially like the way you can use it to remind you of meetings and related activities.
Some Questions About BoomerangGmail.com
Are other browsers going to be supported later on? 
