The Managed Extensibility Framework (MEF) is a new library that will be included in the .NET Framework 4, with builds currently available from CodePlex.com, that enables greater reuse of applications and components. If you are or would like to build extensible applications, extensible frameworks and application extensions, then MEF is for you. Using MEF, .NET applications can be dynamically composed instead of being statically compiled. This talk will provide a general overview of what MEF is and how you can use it in your applications and integrating with Visual Studio 2010.