Modifying a project built using EF Code First, and so far I like what I see. The whole POCO concept seems to work well, especially for a smaller simpler project. I learned a lot about it from this link: http://weblogs.asp.net/scottgu/archive/2010/07/16/code-first-development-with-entity-framework-4.aspx
I also like how you can eaisly define test data to use in place of the database, so that during testing and debugging you don’t have to mess around with a “real” database- you can launch from the same start data every time, or create custom test cases etc.