Strongly typed include in EF

The other day I was talking to my old teacher, Jon Wiberg, at "Ljud & Bild skolan". He told me that he had built a extension for the entity framework that enables you to use a strongly typed version of the ".Include()" method in Entity Framework using a lambda expression. I think it´s a lot better approach then just using "magic strings" as a compiletime error is allways better then a runtime error.