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Charles Petzold: Applications = Code + Markup: A Guide to the Microsoft Windows Presentation Foundation (Pro – Developer)

Wallace B. McClure: Beginning ASP.NET 2.0 AJAX (Programmer to Programmer)

David Hunter: Beginning XML, 4th Edition (Programmer to Programmer)

John Robbins: Debugging Microsoft .NET 2.0 Applications

Dominick Baier: Developing More-Secure Microsoft ASP.NET 2.0 Applications (Pro Developer)

An excellent book for those looking to secure ASP.NET applications through integrated security

Dharma Shukla: Essential Windows Workflow Foundation (Microsoft .NET Development Series)

Christian Nagel: Professional C# 2005 (Wrox Professional Guides)

Joe Kaplan: The .NET Developer’s Guide to Directory Services Programming (Microsoft .NET Development Series)

What I would consider the "Bible" for developers looking to integrate into Active Directory for services

Craig McMurtry: Windows Communication Foundation Unleashed (WCF) (Unleashed)

Adam Nathan: Windows Presentation Foundation Unleashed (WPF) (Unleashed)

An excellent book for those looking to learn WPF/XAML. The color code examples surprised me on how effective it was for conveying the code.