Ben Mauro has released a free 3D environment design tutorial using ZBrush, Keyshot and Photoshop.
ZBrush 4R7 ZModeler
Michael Pavlovich has made this quick run through of the basic functionality of the new ZModeler brush in ZBrush 4R7.
David Richardson - Mech ZBrush Tutorial
David Richardson has created a multiple-part tutorial for modeling a mech in ZBrush.
Ten 24: Free High-Res Scanned Head
Ten 24 are giving away a free high-res scanned head created using an Artec M scanner and retopologised using Lightwave 3D and Zbrush.