David Richardson has created a multiple-part tutorial for modeling a mech in ZBrush.
2 New ZBrush Character Production DVD Releases by Michael Pavlovich
Eat 3D have released two new ZBrush character production DVDs by Michael Pavlovich.
Pixologic have just released ZBrush 4R6, along with the new ZRemesher retopology tool.
Eat 3D - ZBrush 4 R2&R3 - New Features - A Comprehensive Overview
Eat 3D present a tutorial DVD by Michael Pavlovich, featuring a comprehensive overview of Zbrush 4 R2&R3.