Screencasts for Windows SharePoint Services V3...

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It's here  on the "Learn Windows SharePoint Services" page.

Creating and Deploying a Feature Creating and Deploying a FeatureStep through the process of using Visual Studio to create a custom feature.   
Creating and Using Event Handlers Creating and Using Event HandlersCreate a list item receiver class to handle events.   
Creating Custom Document Information Panels Creating Custom Document Information PanelsIntegrate Document Information Panels and content types in Windows SharePoint Services V3.   
Creating Custom Workflows with SharePoint Designer 2007 Creating Custom Workflows with SharePoint Designer 2007Build a custom workflow using SharePoint Designer 2007.   
Customizing a Site with SharePoint Designer 2007 Customizing a Site with SharePoint Designer 2007Understand the difference between page templates and page instances.   
Getting Up and Running with Excel Services Getting Up and Running with Excel ServicesPublish an Excel spreadsheet to a Windows SharePoint Services V3 site.