Email Prioritizer is a plug-in for Outlook that helps you manage email overload. It gives you the ability to temporarily pause new email arrival by clicking its “do not disturb” button and prioritize email with a 0-3 star rating system. This add-in simply adds two buttons to your toolbar, but the power is in how it can simplify your email life.
http://www.officelabs.com/projects/emailprioritizer/Pages/Default.aspx