Elika - concept art from Prince of Persia 2008
Mark Molnar - Sketchblog of Concept Art and Illustration Works: Project Dune - Arrakeen City Guard
Gears of War 3 concept art. - Polycount Forum
Ryse concept art by Silver Saaremäel
Insprational pictures of robot, spaceship and some not so human anatomy.
The Prince Speed Painting - concept art from Prince of Persia 2008