“WebGL: Up and running” is an excellent introduction to WebGL with good examples and a nice overview of the technology. For most of the book the JavaScript library Three.JS is used to simplify the examples. This gets you up and running fast, but also means that you will get more familiar with Three.JS than with WebGL itself.
Read my full book review at DZone:
http://www.dzone.com/reviews/webgl-and-running
Morten Nobel's Blog 
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