I came across interesting app from Xerox. Business of your Brain.
The application claims to understand the importance of emails in your Outlook and save time, make
you productive, ready for business blah blah..
I think it is free, people with Windows XP/7 and Outlook 2003 can try it out.
Unfortunately I am on Linux, so I cannot try it out. I wish they made it work directly
with Microsoft Exchange (using EWS) or GMail so that everybody can use it.