Joseph Drust offers a comprehensive look at using the new ZModeler brush in Zbrush. Pixologic’s 4R7 for ZBrush introduced the the new modeling brush, intended to be a smart polygon modeling system.
ZModeler allows you to quickly and dynamically create new shapes using polygon modeling functions.
ZModeler offers an all in one brush which can add or remove multiple edge loops, beveling, extruding multiple surfaces, smooth subdivision modifiers, bridging holes and surfaces, and more. The brush has a unique snapping ability making it easier to create holes or add edge loops to a shape.
Joseph runs through all of the features of ZModeler in Zbrush in great detail, through Pixologic’s ZClassroom. Check out the complete rundown for using the ZModeler brush in ZBrush there.