Microsoft .NET Framework 3.0 Redistributable Package
Microsoft .NET Framework 3.0 is the new managed code programming model for Windows.
Visual Studio 2005 extensions for .NET Framework 3.0 (Windows Workflow Foundation)
Provides developers with Visual Studio 2005 support for building workflow-enabled applications using Windows Workflow Foundation. This is a fully-supported add-on to Visual Studio 2005.
Visual Studio 2005 extensions for .NET Framework 3.0 (WCF & WPF), November 2006 CTP
Provides developers with Visual Studio 2005 support for building Windows Communication Foundation (WCF) and Windows Presentation Foundation (WPF) enabled applications. This is an un-supported add-on to Visual Studio 2005, but you may find assistance in the MSDN Forums.
Windows SDK for Windows Vista
Web download that includes documentation, samples, and tools designed to help you develop Windows applications and libraries using both Win32® and .NET Framework 3.0 technologies targeting Windows Vista.