Check out the new documents about ...

Windows Mobile application mobile development at MSDN.

The first one is very useful particularly for newbies to make first steps with Windows Mobile Application Development and to get an overview of the Windows Mobile platform, tools and SDKs:
Getting Started with Building Windows Mobile Solutions with Visual Studio and Windows Mobile 6 SDK.

The second one shows you how to use the alpha blending and gradient drawing APIs to create a compelling and attractive user experience on Windows Mobile platforms:
http://msdn.microsoft.com/en-us/library/dd630622.aspx

Have fun!