New in Wolfram Mathematica 6: High-Impact Adaptive Visualization  previous | next 
Voronoi Region Interpolation
Mathematica 6 can interpolate irregularly arranged data, making flat Voronoi regions when the interpolation order is zero.
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ListPlot3D[RandomReal[{0, 10}, {50, 3}], InterpolationOrder -> 0, 

 Filling -> Bottom, Mesh -> None, ColorFunction -> "SouthwestColors"]
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