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NURB Curves: A Guide for the Uninitiated
Excellent tutorial covering NURBS in general, and specifically how to use QuickDraw 3D to create and manipulate NURBS models.
Describes dynamic NURBS (D-NURBS), which enable you to interactively "sculpt" curves and surfaces. Using D-NURBS, you can adjust the curves and surfaces not only by manually adjusting control points and their associated weights (as in traditional NURBS), but can simulate forces and shape constraints.
Excellent tutorial describing how to create a head with NURBS.