I really like this plugin and have been using it for a couple years on tinywords.com, a site for haiku and tiny poetry, in order to send acceptance and rejection notes to people who submit poems for publication. Thanks to iDope for creating it!
To make it a little easier to edit the notifications that get sent out, I added some text fields to the control panel. Now you can customize the "accepted" and "rejected" emails from within WordPress, instead of editing PHP.
I also added an option to send a confirmation email to the person who submits a pending post. It's not strictly necessary, but sometimes people like to get an email "receipt."
If you want this code, I am happy to share it.