Master dDo for Photoshop with this complete overview by Wiktor Ohman.
Art for Games - Memory Folds in Clothing Tutorial
Art for Games have posted a free tutorial on creating memory folds in cloth, using ZBrush and Photosohp.
CGschool - Arch-Vis Training in 3ds Max, Photoshop and V-Ray
CGschool provides world-class architectural visualization training in 3ds Max, V-Ray and Photoshop.
Photoshop CS6 Beta Released
Adobe have just released the Photoshop CS6 Beta online, available for free download.