SharePoint Traing Doc

Forms Authentication in SharePoint Products and Technologies
http://msdn2.microsoft.com/en-us/library/bb975136.aspx

ASP.NET Technical Articles
Microsoft ASP.NET 2.0 Providers: Introduction
http://msdn2.microsoft.com/en-us/library/aa478948.aspx

Free Custom Cross-Site Lookup Column Add-On for WSS v3
http://sharepointsolutions.blogspot.com/2006/11/free-custom-cross-site-lookup-column.html

Plan for administrative and service accounts (Windows SharePoint Services)
http://technet.microsoft.com/en-us/library/cc288210.aspx