Digital Fantasy Painting by Michael Burns (Watson-Guptill, 2002) includes brief (two-page) walkthroughs of a lot of cool images created with a variety of software, including three projects by Glen Southern using ZBrush 
I found those because ZBrush is in the index 
Overall it looked inspiring and educational enough that I bought it tonight in a real store rather than shopping for a discount online
<font color="#949494" size=“1”> November 22, 2002 Message edited by: havran </font>