I’ve been using Mailbox app for a little over a week now and absolutely love it. The app runs on top of Google with iOS and allows you to re-sort and remind you emails meaning getting your inbox to zero is possible all the time. Learn more about the app here - http://vimeo.com/54553882
If you have not jumped in line to get the app, I suggest you do soon. Get the app here - http://j.mp/W5O2Rh
Finally, email has a purpose again.