Windows SharePoint Services 3.0: Software Development Kit (SDK)
Visual Studio Project Templates
Sequential Workflow Library
State Machine Workflow Library
Sample Custom Workflow
Simple Collect Feedback using ASPX forms
VS2005用にWindows WorkFlow Foundation(WF)を利用するためのテンプレートが追加されます。
Windows SharePoint Services 3.0: Software Development Kit (SDK)ダウンロードページ