Creating Normal Maps In ZMapper

From ZBrush Info

If you find that you will be creating normal maps for your models on a regular basis you should take the time to learn Zbrush's ZMapper. ZMapper is a plug-in that offers advanced controls for the creation of normal maps. Previous versions of Zbrush required that ZMapper be installed as a separate plug-in. Now Zbrush 3.1 ships with ZMapper already installed and ready to go.

To Learn About ZMapper Click Here.