Migration and Upgrade Information for SharePoint Developers.
SharePoint Portal Server 2003 and Content Management Server 2002 are truly integrated into a common architecture in Microsoft Office SharePoint Server 2007. Many tasks such as navigation, summary links, and scheduled deployments can now be performed by users or IT professionals.
SharePoint Server 2007 is built upon Microsoft Windows SharePoint Services (version 3), which is based upon Microsoft ASP.NET 2.0. As a result, you can also use functionality such as master pages, authentication providers, and navigation providers in SharePoint Server.
Training Courses and White Papers are available here