Windows® Workflow Foundation is the programming model, engine and tools for quickly building workflow-enabled applications on Windows. It consists of a Microsoft® WinFX® name space (System.Workflow), an in-process workflow engine, and designers for Microsoft Visual Studio 2005. Windows Workflow Foundation is available (currently as Beta) in both client and server versions of Windows and it includes support for both system workflow and human workflow. Windows Workflow Foundation supports a wide range of scenarios including workflow within line-of-business applications, user interface page flow, document-centric workflow, human workflow, composite workflow for service-oriented applications, business rule-driven workflow and workflow for systems management.

Here you can download Beta 1 of the Microsoft Visual Studio® 2005 Extensions for Windows Workflow Foundation. This includes the Windows Workflow Foundation platform components that are required to execute workflows, it also includes the SDK for developing workflow applications and it includes the Visual Studio 2005 designers for workflow.