I have put together a video and sample walking through a simple Sequential Workflow using Beta 1 of WinWF (available for download from Microsoft).
This video will take you step by step through creating your first sequential workflow in less than 15 minutes!
This workflow is hosted by .net using a Windows Form. It takes in an input value and returns a string of how long it took to process the order.
The sample includes two windows form for calling the workflow.
Download the sample code: Sequential Workflow using WinWF
Download the video: My First Sequential Workflow Video