This is a "nice to have":
It would be nice to be able to go to a form entry that has an email address, and click Email to send them an email directly from GF.
In addition, it would be nice to have an automatic email get sent out to an entry if something in their entry status changes - for example, let's say there's a hidden field with a Yes/No value. If the value becomes Yes, then an email is triggered and sent to the email in that entry.