This video describes the hierarchy of the most commonly-used objects in SharePoint 2010. (Length: 2:18)
This demonstration shows how to work with SharePoint farms and the SPFarm object. (Length: 2:11)
This demonstration shows how to work with Web Applications, Site Collections and Sites programmatically. (Length: 4:02)
This video describes how to build SharePoint 2010 artifacts with Visual Studio 2010. (Length: 2:17)