http://www.zbrush.info/wiki/index.php/HD_Sculpting
HD Geometry you can keep your mesh one solid piece and sculpt up to 1 [b:69350a4519]billion[/b:69350a4519] polygons.

For you big time Gamers here that model in 3D
zbrush has a plugin that makes displacement maps
this will allow your model to look high resolution but your model is low resolution,
this helps game player more better because to many polygons will freeze you up while playing.

this pic below was done with a older version of zbrush, one of my Fav
[img:69350a4519]http://www.pixolator.com/images/DARRRCULA01.jpg[/img:69350a4519]