Master dDo for Photoshop with this complete overview by Wiktor Ohman.
Quixel’s immensely popular NDO and DDO have been reimagined, and along with 3DO and MEGASCANS are part of the upcoming Quixel Suite.
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.
nDo2 - Announcement + Open Beta
nDo2 has been announced, so prepare to unleash raw normal mapping power inside Photoshop.