So the guys over at 3D World put together a fantastic magazine featuring a couple of my tutorials done for 3dTotal.com. It came out a while back, but I just picked up my copy this week. Its 228 pages of Zbrush goodness ranging from beginner to advanced.
It was published over in the UK, but follow the link and get your own!
http://www.3dworldmag.com/page/3dworld?entry=learn_zbrush_from_the_masters