David Richardson has created a multiple-part tutorial for modeling a mech in ZBrush.
ZBrush Halloween Contest 2013
Pixologic are hosting a ZBrush Halloween contest, with prizes like a MakerBot 3D Printer or a Wacom 13" HD Cintiq.
ZScripting with ZBrush - Eat 3D Tutorial
Eat 3D have released a video tutorial on ZScripting with ZBrush.