From Pixologic
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http://www.pixologic.com/zbrush/getting-started/
"Welcome to the Getting Started with ZBrush guide! This step by step guide will walk you through the creative world of ZBrush from the basics to sculpting, painting and on to finishing off your art with ZBrush’s powerful render engine.
The Getting Started with ZBrush guide is a live interactive document to use from your computer, containing links to various videos, tutorials, and locations of the numerous Pixologic web pages. "