Allegorithmic have posted a video to overview the user interface of Substance Painter.
Substance Painter - Real-time Creativity
This video shows some real-time features that can be applied with Substance Painter using Substance Effects and Particle Brushes.
The Throne Room Challenge
Allegorithmic brings you The Throne Room, an environment art challenge hosted by Polycount.
Volume 1: the Theory of PBR
Allegorithmic have released the first volume of two on a comprehensive PBR guide.