Excellent work on the quick start guide!  I never got anywhere with
OSG when I last looked at it about 2 years ago, but I remembered it
again after seeing the 2.0 release and the new docs and am
investigating with renewed confidence =)

I noticed one little thing, on page 22:
  "The Drawable class is the base class for storing geometric data,
and Geode stores them in a std::list<osg::Drawable>. Drawable is a pure
virtual class and can't be instantiated directly."

Containers need value semantics, so I figure that must be supposed to
be a std::list<osg::Drawable*>, boost::ptr_list<osg::Drawable>,
std::list< osg::ref_ptr<osg::Drawable> >, or something else similar.

~ Scott
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