title: Fast, templated, C++ Octree implementation
body: <p>I've been searching high and low (mostly on google) for a fast, efficient, templated (ie. with STL-like properties) octree implementation, without success.  I want to use this in the context of a 3D scene graph.</p>
  
  <p>Does such a thing exist, or do people generally roll their own?  I'm hoping my friends at stackoverflow will know where to find one.</p>