Microsoft | Learning has published learning portals for developers wanting to know more about building next generation applications on the .NET Framework 3.0, the 2007 Office System, and Windows Vista:

Specifically, these portals feature free e-learning courses (for a limited time) for developers wanting to learn how to target aspects of the .NET Framework 3.0 like Windows Communication Foundation (WCF), Windows Presentation Foundation (WPF), and Windows Workflow Foundation (WF) and the 2007 Office System. Check it out today!