There is a Big Buzz around New Facebook Mail service or better to say Facebook “The New Messages” Service which is supposed to be killer of all existing email services including my favorite one “GMAIL”.
So Get ready for the NEXT big thing from Facebook and book your invitations at http://www.facebook.com/about/messages/
Here you can find all the Know hows of this new service - http://www.facebook.com/help/?topic=new_messages