Hi Shokan - I think that the Nurbana associated with Blender is a totally different thing than this Nurbana, they just happen to have the same name. The Blender one is a library of NURBS program code.

There is a tutorial for one of those heads on the same site: http://www.3drender.com/jbirn/ea/HeadModel.html

But almost all people who are doing faces and character models these days are using a polygon/subd type modeler to do it (for example Silo, Modo, LightWave, XSI, etc...) , they are just generally more tuned up and oriented towards that kind of work.

- Michael