http://www.macs.hw.ac.uk/modules/F24VS2/Labs/OpenSceneGraphTutorial.pdf
http://www.cs.clemson.edu/~malloy/courses/3dgames-2007/tutor/
http://faculty.nps.edu/jasullivan/osgtutorials/index.htm
http://www.osghelp.com/articles.php
http://www.openscenegraph.org/projects/osg/wiki/Support/Tutorials