Master dDo for Photoshop with this complete overview by Wiktor Ohman.
Free Photoshop Brushes
Several professional artists have made available their Photoshop brushes for free.
You Found Me - Timelapse
Check out this timelapse of Cezar Brandao's recent sculpting livestream.
Natural Media Toolkit for Photoshop
Nate Reeves has created the Natural Media Toolkit for Photoshop, providing versatile new tools in a compact palette.