Download the MicrosoftOfficeSharePointServer 2007 SDK for WindowsWorkflowFoundation from http://www.microsoft.com/downloads/details.aspx?familyid=6D94E307-67D9-41AC-B2D6-0074D6286FA9&displaylang=en

Who it’s for: MOSS developers

Where it installs: c::\2007 Office System Developer Resources\

What it contains (from http://blogs.msdn.com/randalli/archive/2006/11/16/get-the-rtm-sdks-for-sharepoint-moss-and-wss-and-project.aspx):

• SharePoint Server 2007 SDK Documentation (OSSSDK2007.chm)
• Office Forms Server 2007 SDK Documentation (OFS12sdk.chm)
• Windows SharePoint Services 3.0 SDK Documentation (WSS3sdk.chm)
• MOSS SDK Code Samples to use in conjunction with SDK documentation
• 5 Business Data Catalog (BDC) Metadata Samples
• Pluggable Single Sign-on (SSO) Provider
• Sample Web Service
• Web Part Filters and Consumers
• ECM Starter Kit
• ECM feature extension code samples
• Content Processing: Document Converters (Comment Scrub Converter) and Term Replacement Document Inspector
• Records Management: De-duplication Router, Document Integrity Policy Feature, Records Repository Submit, Sample Barcode Provider, and Search Collect and Hold
• Supplemental developer whitepapers:
• Digital Signatures in the 2007 Microsoft Office System: A Developer's Guide
• Encryption and Rights Management in the 2007 Microsoft Office System: A Developers Guide
• Importing Custom Actions into Microsoft Office SharePoint Designer 2007
• Workflow Security in Windows SharePoint Services and Office SharePoint Server 2007
• Introduction to Information Rights Management White Papers
• Configuring Information Rights Management in Windows SharePoint Services 3.0
• Information Rights Management in Windows SharePoint Services 3.0: An Overview
• Pluggable Rights Management in Windows SharePoint Services 3.0
• Visual Studio Workflow templates for MOSS
• Approval Workflow Sample
• ASPX Collect Feedback
• Confidential Approval Sample
• Custom Reports
• ECM Activities
• Group Approval
• Hello World Sequential
• InterSystem Workflow
• List Item Activities
• Modification Sample
• Multistage Workflow
• Replicator Contact Selector Sample
• Signatures Workflow Sample
• State Machine Approval Workflow

See also Microsoft WindowsSharePointServices