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But here are a few links that might strike your fancy.
Discover main features of ZBrush
New additions to ZBrush 4R7
ZBrushCentral community forum
The ZBlog: official ZBrush blog
ZBC Top Row
ZBrush User Stories
ZClassroom ZBrush tutorials
Getting Started with ZBrush Guide
3rd Party Training
Find a ZBrush school near you
List of features within Sculptris
Sculptris image gallery