.NET 3.0

Microsoft’s .NET Framework 3.0 (formerly codenamed “WinFX”), is the new managed code programming model for Windows. It combines the power of the .NET Framework 2.0 with four new technologies:

1. Windows Presentation Foundation (WPF)
2. Windows Communication Foundation (WCF)
3. Windows Workflow Foundation (WF)
4. Windows CardSpace

Use the .NET Framework 3.0 to build applications that have visually compelling user experiences, seamless communication across technology boundaries, the ability to support a wide range of business processes, and an easier way to manage your personal information online.

Figure - The .NET Framework 3.0.

Windows Communication Foundation

Discover the new breed of communications infrastructure built around the Web services. This suite of .NET technologies for building and running connected systems unifies a broad array of distributed systems capabilities in a composable and extensible architecture to provide secure, reliable, and transacted messaging along with interoperability.

Windows Presentation Foundation

Find information to help you learn about the Windows Presentation Foundation, Microsoft's technology for building applications and high fidelity experiences in Windows Vista, blending together application UI, documents, and media content, while exploiting the full power of your computer. Get hands-on labs, samples, and more.

Windows Workflow Foundation

Learn all about Microsoft's new programming model, engine and tools for quickly building workflow-enabled applications on Windows. Windows Workflow Foundation includes support for both system workflow and human workflow across a wide range of scenarios.

Windows CardSpace

Find out how to build applications with Windows Cardspace (formerly "InfoCard"), Microsoft's technology for managing digital identities.

Note: For More Details about Framework 3.0, Please Refer the following Link

http://msdn2.microsoft.com/en-us/netframework/aa663309.aspx