Updated and improved documentation for .NET Micro Framework 3.0 was released in February. Now you can have full reference for Micro Framework classes always available on your hard drive.
I believe this will finally solve problems with finding right reference for some classes. Don’t wait and start downloading from MSDN: .NET Micro Framework SDK 3.0 February 2009 Documentation Update.
Update is a simple zip file with documentation and readme.txt describing the installation process. It’s nothing more than copying PSDK.hxs from zip archive into the C:\Program Files\Microsoft .NET Micro Framework\v3.0\Documentation\NET MicroFramework Docs