WSS videos

Here is a list of links to good wss videos:

tedpattison.net:
Building ASP.NET Web Parts for Windows SharePoint Services 3.0
Creating Windows SharePoint Services Sites with Support for Wikis and Blogs
Creating and Using Site Columns in Windows SharePoint Services 3.0
Creating and Using Content Types in Windows SharePoint Services 3.0
Creating and Deploying a Feature for Windows SharePoint Services 3.0
Creating and Using Event Handlers in Windows SharePoint Services 3.0
Creating Custom Workflows with the SharePoint Designer 2007
Customizing a Windows SharePoint Services 3.0 site with the SharePoint Designer 2007

msdn conference videos:
Windows SharePoint Services Platform (contains 9 videos about 1 hour each)

msdn screencasts:
Many good screencasts here! (some of them are the same as in the tedpattison.net list above)