Stan Winston School are sharing a free Photoshop character design tutorial by Dan Luvisi.
Gnomon - Design Techniques for 3D Concept Art
The Gnomon Workshop present Design Techniques for 3D Concept Art, a DVD tutorial by Gavriil Klimov.
Cyborg Design - Concept Art Production Techniques
Instructor Michael Pedro gives a detailed overview on concept art production techniques in ZBrush and Photoshop.
Natural Media Toolkit for Photoshop
Nate Reeves has created the Natural Media Toolkit for Photoshop, providing versatile new tools in a compact palette.