PhilC Designs has a site at www.philc.net/. 

I've tried his Clothing Designer, OBJ2CR2, and his Scissors tools.

Clothing Designer allow you to create simple clothing in Poser.

OBJ2CR2 allows you to create the body groups on your mesh to correspond to the body groups that it sits over on the model in Poser.

The Scissors tool allow you to perform boolean cuts on the meshes in Poser.

As far as ZBrush, Gnomon Workshop has a tutorial for Character Modeling for Next-Gen Games.  It show you how to create in Zbrush, export high mesh object to Maya, create low mesh object using ZBrush obj model as template.  It's geared towards modeling for games (low poly count) and controlling what areas should get additional geometry.