http://www.gnomonschool.com/blog/career/vfx-career-profile-concept-artists this is a great site with really useful and interesting info about concept art as a career and techniques and discussions about concept art for contemporary games etc, really inspirational stuff. again they emphasis how you really have to try hard not to lose your art sketching skills as this is easily done when you work in digital 3D media. and they talk about creatiivity and the buzz of creating new worlds for work,