Windows Platform Webcast Follow-up
During the Ignite Your Coding web cast on November 6, I showed an application that showed the differences between a single threaded application and a multithreaded application. Here is the source code for that example located on my Public SkyDrive (it's big because it also contains some large XML files).
If you are interested in a few more resources regarding the internals of Windows, you can also check out Microsoft Windows Internals - the book doesn't cover Vista - however, it does go into an extreme level of detail. I also talked a bit about some of the features of .NET 3.0 - you can always find information on those frameworks here: http://www.netfx3.com/. In addition, if you're looking to find out more about development on the Windows client, specifically using Windows Presentation Foundation - check out http://windowsclient.net/