Two really interesting downloads to help you build real world Windows Mobile applications:
1) SyncComm (http://synccomm.codeplex.com) is designed to provide you with a starting point for building WCF sync framework applications.
2) Microsoft® Windows Mobile® 6 Consumer Solution Accelerator is designed to help developers see how they can harness the power of Windows Mobile to craft compelling consumer solutions. The Consumer Solution Accelerator consists of a documented sample Visual Studio project as well as documents which detail the creation of the project and how it functions.
The second item isn’t that intuitive to get up and running, especially if you get build errors in Visual Studio. Don’t forget you may need to import the developer certificates that come with the Windows Mobile SDK into your local certificate store on your computer in order for the cab build to work.