These are the selective sections I found quite usefull for .Net enthusiasts, not only for the beginngers but also for the pros.

.Net Framework Technology Overview

Microsoft .NET is software that connects information, people, systems, and devices. It spans clients, servers, and developer tools http://msdn.microsoft.com/netframework/technologyinfo/overview/

Designing .Net Class Libraries

The Designing .NET Class Libraries series presents design guidelines for developing classes and components that extend the .NET Framework. http://msdn.microsoft.com/netframework/programming/classlibraries/

.Net Framework Class Library Reference

A quick reference http://msdn2.microsoft.com/en-us/library/ms306608.aspx