Back in February 2006 Tony Gumbel proposed the idea of a Notification Pepper that would send the Mint user an email when a specified criteria had been met.
Notification is a pane-less Mint pepper that sends the site owner an email when a specified criteria is met. The user can select between total or unique visits for either the hour, day, week, month, or overall time period. This could be used to find out when your site reaches a specific milestone, or to find out when previous months hits have been passed.
Definitely a great Pepper that should be installed in your version of Mint.