Does anyone miss these?
Enable read receipts
Editions supported: Read receipts are available only in Google Apps for Business, Education, and Government. Compare editions now
A read receipt is an email notification delivered to the sender when a recipient opens (and presumably reads) an email. The receipt confirms that the recipient saw the message and records the time. See Requesting read receipts for more information.
AwayFind is a digital assistant for your email-you can close your inbox but still receive urgent messages
Identify which emails for us to look out for
Stop constantly checking email-we'll find your timely messages
Be notified of important messages immediately over SMS, IM, Twitter, or even a phone call