As of Version 7.0, BarChart3D is part of the built-in Mathematica kernel.
As of Version 7.0, FourierSeries is part of the built-in Mathematica kernel.
As of Version 7.0, FourierTrigSeries is part of the built-in Mathematica kernel.
As of Version 6.0, NIntegrate natively supports InterpolatingFunction objects.
As of Version 7.0, HistogramScale has been superseded by an optional argument hspec for the built-in Mathematica function Histogram.
As of Version 7.0, some of the functionality of the Splines Package is now built into the Mathematica kernel. >>
As of Version 8.0, BoxWhiskerPlot has been renamed to BoxWhiskerChart and is part of the built-in Mathematica kernel.
As of Version 8.0, QuantilePlot is part of the built-in Mathematica kernel.
As of Version 8.0, ReferenceLineStyle is part of the built-in Mathematica kernel.