The Visual Studio 2005 developer guide for System.Transactions is now available at http://msdn2.microsoft.com/en-us/library/w97s6fw4(en-US,VS.80).aspx under MSDN Library\Visual Studio 2005\Product Documentation\Visual Studio\.Net Framework Programming in Visual Studio\Accessing Data\Transaction Processing.

 

It has three sections: Fundamentals, Writing a Transactional Application and Implementing a Resource Manager.

 

The System.Transactions namespace is defined at http://msdn2.microsoft.com/en-us/library/a90c30fy