Essential SharePoint 2007: A Practical Guide for Users, Administrators and Developers
6.14. Resources
To get
Look here
More information on enabling email for a library
"Configuring E-Mail Enabled Document Libraries" in WindowsSharePointServicesAdmin.chm or http://www.microsoft.com/resources/documentation/wss/2/all/adminguide/en-us/stse15.mspx