I absolutely love your re-send option to contact who have not yet opened an email sent. That being said, I would love it if we could schedule an email to go out 1 or 2 days after the original email. It would be very useful if we are hosting events and want to send an email with confirmation and/or changes to the event.
In regards to the social media publishing features, I would love it if we were able to publish the social media posting at the same time as we were to publish the email. I know that MailChimp offers this feature and it is a feature I quite miss. Also, I don't believe Constant Contact currently allows us to upload our own image to be published on social media, that would be a very useful tool as well!