Master dDo for Photoshop with this complete overview by Wiktor Ohman.
Ultraflares is a lens-flare and light studio plug-in for Photoshop and compatible hosts.
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.
Natural Media Toolkit for Photoshop
Nate Reeves has created the Natural Media Toolkit for Photoshop, providing versatile new tools in a compact palette.