Caustic

http://www.truecg.com/index.php?option=com_content&task=view&id=42&Itemid=29

A good tutorial resource, from Maya to Blender. this link is about how to render Caustic of glasses(refractions) in maya. simple and direct.

http://www.interstation3d.com/maya/tutorials/mray_caustics/caustics_example0203.htm

another more detailed site about doing Caustic of ocean, reflective object

Learning Normal Map

"I've learned a lot about high-end real-time graphics in the past few years with a lot of help from the online community. I decided to return the favor by posting some tutorials covering the some of the topics I've learned about. " BEN CLOWARD, Character Animator

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Resource

from texture images to tutorials. wonderful sharings!

CREATING AND USING NORMAL MAPS

NORMAL MAPS: PART II - BEYOND THE BASICS

NORMAL MAP ON HUMAN BODY (FROM HIGHEND 3D)

http://www.highend3d.com/maya/tutorials/rendering_lighting/general/259-1.html