Programming Guide [LINQ to SQL]
This section contains information about how to create and use your LINQ to SQL object model. If you are using Visual Studio, you can also use the Object Relational Designer to perform many of these same tasks.
You can also search the MSDN Library for specific issues, and you can participate in the LINQ Forum, where you can discuss more complex topics in detail with experts. Finally, the LINQ to SQL: .NET Language-Integrated Query for Relational Data white paper details LINQ to SQL technology, complete with Visual Basic and C# code examples.