WebGL Resources:

Khronos: WebGL	The Khronos Group consortium API specifications for WebGL
WebGL reference card	Useful reference cards for the WebGL API
Chrome WebGL Experiments	Google chrome experiments in WebGL
MDN WebGL	Mozilla Developer Network topics in WebGL
WebGL examples	30 amazing examples of WebGL in action
WebGL Academy	Learn WebGL
Learning WebGL	WebGL tutorials
WebGL Programming Guide	Source Code from WebGL Programming Guide, by Matsuda & Lea

Textbook Resources:

Interactive Computer Graphics, 7E	Contains code, figures, lectures, solutions, etc.
Interactive Computer Graphics, 7E: Source Code	Contains source code and Common libraries

Miscellaneous:

Edward Angel's Homepage

Contains links for the textbook and SIGGRAPH