The Post Status Notifications plugin by 99 Robots provides an easy way to ensure Administrators are notified of their Contributors posts submissions.
Adds post status links–e.g. "Draft" (7)–to post type admin menus and a few other nice goodies.
Simple post status notifications sends emails to authors and editors when the post status change.
Modify Edit Flow options via bulk and quick edit panels in conjunction with Custom Bulk/Quick Edit by Aihrus.
Redefining your editorial workflow.