MSDN Mobile and Embedded Developer Center:
http://msdn.com/mobility

MSDN Smart Client Developer Center (Code Samples):
http://msdn.com/smartclient/codesamples

Getting Started with Visual Studio .NET and the Microsoft .NET Compact Framework:
http://msdn.microsoft.com/mobility/prodtechinfo/devtools/netcf/default.aspx?pull=/library/en-us/dnnetcomp/html/netcfgetstarted.asp

.NET Compact Framework FAQs:
http://msdn.microsoft.com/mobility/prodtechinfo/devtools/netcf/FAQ/default.aspx

CaveManHank VB Sample:
http://www.gotdotnet.com/Community/UserSamples/Details.aspx?SampleGuid=aef48b4c-9345-4138-ac75-0248bc5b7691

Web service directory:
http://xmethods.com

ASP.NET Mobile controls:
http://msdn.microsoft.com/mobility/prodtechinfo/devtools/asp.netmc/default.aspx
http://msdn.microsoft.com/library/en-us/dnanchor/html/anch_mobilewebdev.asp

Smart Clients:
http://msdn.com/smartclient
http://msdn.com/smartclient/understanding

Differences between the .NET Compact Framework and the .NET Framework:
http://msdn.microsoft.com/mobility/prodtechinfo/devtools/netcf/FAQ/default.aspx#1.7
http://download.microsoft.com/download/4/d/f/4dfc7768-5017-40a4-8ddb-577720a32e5d/NET_Compact_Framework.chm

Signature application sample:
http://msdn.microsoft.com/mobility/prodtechinfo/devtools/netcf/default.aspx?pull=/library/en-us/dnnetcomp/html/PPCSignatureApp.asp

Consuming Web Services with the Microsoft .NET Compact Framework
http://msdn.microsoft.com/mobility/prodtechinfo/devtools/netcf/default.aspx?pull=/library/en-us/dnnetcomp/html/netcfwebservices.asp

Designing "Sometimes Off-line" Microsoft .NET Compact Framework Applications
http://msdn.microsoft.com/mobility/prodtechinfo/devtools/netcf/default.aspx?pull=/library/en-us/dnppc2k3/html/sometimesoffline2.asp

Creating a Multiple Form Application Framework for the Microsoft .NET Compact Framework
http://msdn.microsoft.com/mobility/prodtechinfo/devtools/netcf/default.aspx?pull=/library/en-us/dnnetcomp/html/netcfuiframework.asp

Creating Custom Controls for the .NET Compact Framework
http://msdn.microsoft.com/mobility/prodtechinfo/devtools/netcf/default.aspx?pull=/library/en-us/dnnetcomp/html/customctrlscompactfx.asp

Interoperability:
Creating a P/Invoke Library
http://msdn.microsoft.com/mobility/prodtechinfo/devtools/netcf/default.aspx?pull=/library/en-us/dnnetcomp/html/pinvokelib.asp
An Introduction to P/Invoke and Marshaling on the Microsoft
http://msdn.microsoft.com/mobility/prodtechinfo/devtools/netcf/default.aspx?pull=/library/en-us/dnnetcomp/html/netcfintrointerp.asp
Advanced P/Invoke on the Microsoft .NET Compact Framework
http://msdn.microsoft.com/mobility/prodtechinfo/devtools/netcf/default.aspx?pull=/library/en-us/dnnetcomp/html/netcfadvinterop.asp
Using Dumpbin.exe as an Aid for Declaring P/Invokes
http://msdn.microsoft.com/mobility/prodtechinfo/devtools/netcf/default.aspx?pull=/library/en-us/dnnetcomp/html/netcfdumpbinpinvoke.asp

Deployment:
Creating an MSI Package that Detects and Updates the .NET Compact Framework
http://msdn.microsoft.com/mobility/prodtechinfo/devtools/netcf/default.aspx?pull=/library/en-us/dnnetcomp/html/netcfdepl.asp
Create Self-Updating Applications With the .NET Compact Framework
http://msdn.microsoft.com/mobility/prodtechinfo/devtools/netcf/default.aspx?pull=/library/en-us/dnnetcomp/html/autoupdater.asp
Developing and Deploying Pocket PC Setup Applications
http://msdn.microsoft.com/mobility/prodtechinfo/devtools/netcf/default.aspx?pull=/library/en-us/dnnetcomp/html/netcfdeployment.asp

Games:
Creating a Splash Screen Form on a Separate Thread with .NET Compact Framework
http://msdn.microsoft.com/mobility/prodtechinfo/devtools/netcf/default.aspx?pull=/library/en-us/dnnetcomp/html/casoast.asp
Writing Mobile Games Using the Microsoft .NET Compact Framework
http://msdn.microsoft.com/mobility/prodtechinfo/devtools/netcf/default.aspx?pull=/library/en-us/dnnetcomp/html/netcfgaming.asp
Create a Managed Graphics Library Using Game API
http://msdn.microsoft.com/mobility/prodtechinfo/devtools/netcf/default.aspx?pull=/library/en-us/dnnetcomp/html/wrapgapi1.asp
Gaming with the .NET Compact Framework
http://msdn.microsoft.com/mobility/prodtechinfo/devtools/netcf/default.aspx?pull=/library/en-us/dnnetcomp/html/GManGame.asp

Community:
http://OpenNETCF.org
http://codeproject.com/netcf