Ben Mauro has posted a ZBrush video tutorial, focusing on the development of his Yukon Pit Crew project.
Pixologic have just released ZBrush 4R6, along with the new ZRemesher retopology tool.
David Bentley - ZBrush Vehicle Design
David Bentley walks us through his automotive design process, using ZBrush.
David Richardson - Mech ZBrush Tutorial
David Richardson has created a multiple-part tutorial for modeling a mech in ZBrush.