Advanced Flattening - from Rhino Labs

Rhino Labs has announced an early prototype of a tool to flatten a non-developable (curved in two directions) 3-D mesh or NURBS surface into a flat 2-D pattern.

Expander from Ship Constructor for Rhino 3.0 does a good job of flattening but will not be available Rhino 4.0. Rhino Labs has developed a replacement. This is the first prototype.
Details on Rhino Wiki Link