1)Windows SharePoint Services 3.0 SDK (online version: http://msdn2.microsoft.com/en-us/library/ms441339.aspx)
New/updated sections include:
§ Solutions schemas
§ Forms
§ Web Services Nodes re-architected, legacy content updated
§ Content Types and Columns conceptual nodes extensively updated
§ Feature schema reference topics added for Content Types, Content Type Binding, and Workflow
§ Document Parser node added, including reference topics for the document parser API
§ IRM node extensively updated/expanded, including reference topics for the revised IRM API
§ XML Parser node added
§ And much more! 2)Microsoft Office SharePoint Server 2007 SDK (online version: http://msdn2.microsoft.com/en-us/library/ms550992.aspx)
New/updated sections include:
§ Business Data Catalog - object model
§ Business Data Catalog - warnings and error messages
§ Metadata Model and “How to” topics
§ Custom Caching Overview: 4 new topics dedicated to caching in MOSS. The “How to: Extend Caching by Using the VaryByCustom Event Handler” topic has also been revised and expanded
§ Web Content Management (WCM) “How to” topics, including “How To: Create a Minimal Master Page” and “How to: Customize Page Editing Toolbar Components”
§ ~370 member topics in the Microsoft.SharePoint.Publishing.* namespace
§ Field Controls and Control Templates
§ And much more!