A great MSDN article to get an overview of Windows Presentation Foundation (formerly code-named "Avalon") and a context for this new graphics subsystem.
My Books......
Pro .NET 1.1 Network Programming, Second edition
Pro .NET Directory Services Programming
WebSphere and .NET Coexistence
Integrating DB2 Universal Database for iSeries with Microsoft ADO .NET
DB2 UDB V8.2 on the Windows Environment