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Download latest microsoft enterprise architecture from http://msdn.microsoft.com/en-us/library/cc512464.aspx the library has 7 main block, which basically helps in quick development.

Application Block	Description
Caching Application Block	Enables you to integrate a caching mechanism in your application
Configuration Application Block	Provides an extensible API for the configuration of your application (The Enterprise Library also provides you a GUI to configure your application.)
Data Access Application Block	Enables you to implement a very consistent data-access strategy in your application or your enterprise
Cryptography Application Block	Enables you to encrypt sensitive information
Exception Handling Application Block	Provides a consistent and configurable approach for exception-handling strategies in your applications
Logging and Instrumentation Application Block	Enables you to trace and log the internal runtime details of your application
Security Application Block	Provides authentication and authorization features for your applications