James Busby demonstrates nondestructive image flattening and reflection removal in Photoshop.
Free Photoshop Brushes
Several professional artists have made available their Photoshop brushes for free.
Ben Mauro - ZBrush for Environments
Ben Mauro has released a free 3D environment design tutorial using ZBrush, Keyshot and Photoshop.
Adobe Integrates Sketchfab Into Photoshop
Adobe has partnered with Sketchfab to bring 3D publishing to Photoshop.