http://blog.selfshadow.com/publications/s2014-shading-course...
http://blog.selfshadow.com/publications/s2013-shading-course...
http://blog.selfshadow.com/publications/s2012-shading-course...
http://advances.realtimerendering.com/s2011/index.html (not sure there was one in 2011...)
http://renderwonk.com/publications/s2010-shading-course/
This is a good, high-level intro:
https://www.marmoset.co/toolbag/learn/pbr-theory
https://www.marmoset.co/toolbag/learn/pbr-practice
This page has links to more than you ever want to read:
https://interplayoflight.wordpress.com/2013/12/30/readings-o...