Here are some useful web sites for 3D artists.
Highend3D (http://highend3d.com)
An amazing resource for 3D tools, scripts, information. All of the major art creation tools are there: 3D Studio Max, Maya, ZBrush, etc..
ZBrushCentral (http://zbrushcentral.com)
ZBrush (http://pixologic.com)
For ZBrush (a fantastic tool for creating and sculpting 3D meshes for 3D concept art creation and for refining meshes created in other programs)
Renderosity (http://www.renderosity.com)
Community site for 3D modelers and animators.