| New book on the Grunfeld
It's an Everyman Chess publication by Yelena Dembo. It has some really good info in there for Black. In particular there is an alternative to the main line 8. Rb1 line, where Black plays the typically theory heavy, 9...Nc6. Dembo points out a more recent move that has been used by Svidler, Eljanov and Navara, 9...b6. Check it out, its a great book.