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Wow- I really like Auxpecker. It is very light but highly pleasant to use.
http://auxpecker.blogspot.com/ 
Screen Grab from Rhino. I brought the Silo files into Rhino via the t-splines importer. Again very cool stuff. The above are the results of the t-spline conversion process. Pretty much what the subdivision process does for sub-d models- but for nurbs.
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Visualization in Auxpecker