We all heard about Facebook intention to unified communications. So now most of Facebook users are trying to get their hands in one of @facebook addresses, but having your email address from Facebook is a new feature that is not open for everybody just yet, for now the only way to get one is to request an invite.
To request an invite and get a Facebook email address, first go to http://www.facebook.com/about/messages/, second login with your Facebook account, third click the Request an Invitation button, and that’s it! Now the hard part is to wait until you get your new email address. After you received the invitation your email address will match your Facebook username, for example: If your link in Facebook is your new email address will be [email protected].