I am senior developer at CheaperThanDirt.com. I have been working with Entity Framework since its first release. I have written an ebook on Entity Framework version 1. For version 4, I have written Entity Framework 4.0 Recipes book for Apress. The book covers common problems developers face when building applications with Entity Framework. http://amzn.com/1430227036

You can also visit my blog where I mostly talk about Entity Framework. http://weblogs.asp.net/zeeshanhirani