Pixologic have just released ZBrush 4R6, along with the new ZRemesher retopology tool.
ZScripting with ZBrush - Eat 3D Tutorial
Eat 3D have released a video tutorial on ZScripting with ZBrush.
Military Character Assets with Joseph Drust
Joseph Drust has created in-depth video tutorials on creating detailed military character assets in ZBrush.