Ben Mauro has posted a ZBrush video tutorial, focusing on the development of his Yukon Pit Crew project.
ZBrush 4R5 - Making Time for Art - The Dragon Flyer
The cool new features of ZBrush 4R5 are demonstrated in this video by Pixologic.
FiberMesh for ZBrush 4R2b
With an update for ZBrush later this month, Pixologic are previewing FiberMesh, a new tool for fur and hair.