What is the best way to use EF 4 and DDD

I would like to use EFf 4 as my ORM in my DDD project. I am going to generate 开发者_如何学Cmy model based on my classes. Should I create classes that are basically dto objects for my business objects to consumer or should I implement the actuall BO classes in my EF model?

I think that the EF model should be the business objects, otherwise you will just have another layer of abstraction that you will have to write plumbing code for.