Windows Presentation Foundation (WPF) is the next generation presentation sub-system for Windows. It provides developers and designers with a unified programming model for building rich Windows smart client user experiences that incorporate UI, media, and documents.

• WPF Developer Center on MSDN – it all starts with the MSDN Dev Center
• WPF Community Site – tons of samples, tutorials, whitepapers, code snippets, controls, and more!
• WPF in .NET Framework 3.0 SDK – WPF SDK reference
• Top Ten UI Development Breakthroughs in WPF – a great article on the top features in WPF
• The XAML Wiki – central place for designers and developers to find and share XAML samples, controls, and styles
• WPF Hands-On Labs – set of tutorials that introduce key features of WPF, guiding you step-by-step through the process of developing a complete WPF app
• Getting Started with WPF – a great intro to get you up to speed
• WPF Samples – more sample WPF apps
• Optimize WPF Application Performance – once you’ve gotten started, then you’ll need to learn how to optimize performance
• WPF SDK Team Blog – ’nuff said

Windows Communication Foundation (WCF) is Microsoft’s unified framework for building secure, reliable, transacted, and interoperable distributed applications.

• WCF Developer Center on MSDN – it all starts with the MSDN Dev Center
• WCF Community Site – tons of samples, tutorials, whitepapers, and more!
• WCF Architecture Overview – high-level overview of WCF architecture and key concepts
• WCF in the .NET Framework 3.0 SDK – WCF SDK reference
• Introduction to Building WCF Services – a great intro article to get you started

Windows Workflow (WF) is the programming model, engine, and tools for quickly building workflow enabled applications. WF radically enhances a developer’s ability to model and support business processes.

• WF Developer Center on MSDN – it all starts with the MSDN Dev Center
• WF Community Site – tons of samples, walkthroughs, activities, and more!
• WF in the .NET Framework 3.0 SDK – WF SDK reference
• Cutting Edge: Windows Workflow Foundation, Part 1 – Dino Esposito does it again, with a great article on WF
• Cutting Edge: Windows Workflow Foundation, Part 2 – continuation of exploration of WF

Windows CardSpace enables users to provide their digital identities in a familiar, secure, and easy way. In the physical world we use business cards, credit cards, and membership cards. Online with CardSpace we use a variety of virtual cards to identify ourselves, each retrieving data from an identity provider. Don’t struggle with usernames and passwords, just choose an information card!

• CardSpace Developer Center on MSDN – it all starts with the MSDN Dev Center
• CardSpace Community Site – tons of samples, walkthroughs, and more!
• CardSpace in the .NET Framework 3.0 SDK – CardSpace SDK reference

Windows Vista

• Windows Vista Developer Center on MSDN – it all starts with the MSDN Dev Center
• Windows Vista Virtual Labs – a great walkthrough for understanding Vista development
• Top 10 Ways to Light Up Your Windows Vista Apps – great overview of new features developers can take advantage of in Windows Vista