I had the pleasure of reviewing an early release of Julie Lerman's Programming the Entity Framework. Julie just reported that it has just been sent to print. Having published LINQ in Action last year, I know what a relieve it can be to get a project of this size out the door.
It is a good read full of information that is only possible to gain by using it in real life applications. She's done a good job not only of presenting the framework, but also giving recommendations on how to use it in a variety of application environments. Special attention is given to the trials and tribulations of building n-tier applications with the Entity Framework.
If you are interested in taking your LINQ knowledge and moving up to the Entity Framework, I recommend checking it out. Head on over to her blog to find out how to pre-order your copy.