You all can discuss Nurbs or Subdivision surfaces till the end of world, but the real truth is, they complement each other more then anyone wants to admit !!! :) There are things where Nurbs do fail a lot...:O) In organic modeling, in order to animate model, polygon flow can (and must) be directed properly, this is a very important (usually overlooked) issue becouse poly models can bend only on their edges, and nurbs-to-mesh conversion is still far away from elegant solution for this, but when it comes to mechanical modeling nurbs do rule (very fast and accurate). I seen many organic models made in Rhino, for example, but hardly anyone animates them (ever wondered why?). All major packages have both (ever wondered why, again ?)!!! :) I am, and always will use both, if there is, like it used to be ( remember "Nurbana" project? ), free app which is similar to Rhinoceros, everybody would jump on it, and then, there would be no limits, ever :)