Windows Workflow Foundation Overview
Windows Workflow Foundation is the programming model, engine and tools for quickly building workflow enabled applications on Windows. It consists of a Microsoft .NET Framework version 3.0 formerly WinFX namespace, an in-process workflow engine, and designers for Visual Studio 2005. Windows Workflow Foundation is available in beta for both client and server versions of Windows.
Test out Windows Workflow Foundation – Beta 2 using Virtual Labs
Try out Windows Workflow Foundation Beta 2 in this MSDN Virtual Lab.
Dino Esposito has a two part article on Windows Workflow Foundation - Cutting Edge - in MSDN magazine. Part 1, and Part 2.
Windows Workflow Foundation - blog post from ScottGu with lot's of links on, you guessed it - Windows Workflow Foundation.