Ben Mauro has released a free 3D environment design tutorial using ZBrush, Keyshot and Photoshop.
ZBrush to Keyshot Bridge
At last ZBrush and KeyShot are seamlessly integrated through the new ZBrush to Keyshot Bridge.
Character Pipeline for Games R2
Check out Kurt Papstein's new program for Phoenix Atelier, Character Pipeline for Games.
David Richardson - Mech ZBrush Tutorial
David Richardson has created a multiple-part tutorial for modeling a mech in ZBrush.