David Richardson has created a multiple-part tutorial for modeling a mech in ZBrush.
Gavin Goulden - Kobold Sculpt Video and ZBrush File
Gavin Goulden has posted a free timelapse video of him sculpting a kobold bust in ZBrush. (final kobold file included)
You Found Me - Timelapse
Check out this timelapse of Cezar Brandao's recent sculpting livestream.
David Bentley - ZBrush Vehicle Design
David Bentley walks us through his automotive design process, using ZBrush.