Editorial note: EF 4.1 was released as part of the .Net 4 Platform Update 1 release. You should use the information at http://blogs.msdn.com/b/adonet/archive/2011/04/11/ef-4-1-released.aspx for training now.

For those of you interested in POCO In EF4, here's a list of links that you should read to grok:

1. http://blogs.msdn.com/b/adonet/archive/2009/05/21/poco-in-the-entity-framework-part-1-the-experience.aspx
2. http://blogs.msdn.com/b/adonet/archive/2009/05/28/poco-in-the-entity-framework-part-2-complex-types-deferred-loading-and-explicit-loading.aspx
3. http://blogs.msdn.com/b/adonet/archive/2009/06/10/poco-in-the-entity-framework-part-3-change-tracking-with-poco.aspx
4. http://blogs.msdn.com/b/adonet/archive/2009/06/16/using-repository-and-unit-of-work-patterns-with-entity-framework-4-0.aspx
5. http://blogs.msdn.com/b/adonet/archive/2009/06/22/feature-ctp-walkthrough-code-only-for-the-entity-framework.aspx
6. http://blogs.msdn.com/b/efdesign/archive/2009/08/03/code-only-enhancements.aspx
7. http://blogs.msdn.com/b/efdesign/archive/2009/10/12/code-only-further-enhancements.aspx

And if you are using the new Code First CTPs here's the list you should also read:

1. http://www.microsoft.com/downloads/en/details.aspx?FamilyID=4e094902-aeff-4ee2-a12d-5881d4b0dd3e&displaylang=en (the code)
2. http://blogs.msdn.com/b/adonet/archive/2010/09/02/ef-feature-ctp4-dbcontext-and-databases.aspx
3. http://blogs.msdn.com/b/adonet/archive/2010/07/14/ctp4codefirstwalkthrough.aspx