I found this FREE download interesting. Firstly, let me say up front that this is NOT geared towards SharePoint, if you want a SharePoint-based Approval Workflow, you should check out my blog postings and How-to Videos here. This starter kit is geared around the ASP.NET developer who wants to build an Approval Workflow in a Web-based app. That being said, many of the concepts are similar to those for SharePoint, since SharePoint Workflow is based on The Windows Workflow Foundation.
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Here's the download link: Click here
~Robert Shelton