RevolutionPlot3D has been added to the built-in Mathematica kernel.

As of Version 7, the Histograms Package has been integrated into the Mathematica kernel.

The functionality in Miscellaneous`Audio` is now available through the newly created Audio Package.

Much of the functionality in Miscellaneous`CityData` is now available in the built-in Mathematica kernel function CityData.

All the functionality in Miscellaneous`WorldData` is now available in the built-in Mathematica kernel function CountryData.

All the functionality in NumberTheory`PrimeQ` is now available through the newly created Primality Proving Package.

All the functionality of NumericalMath`InterpolateRoot`is now available in the newly created Function Approximations Package.

The functionality of NumericalMath`ListIntegrate` is now accessible by using the built-in Mathematica kernel functions Integrate and Interpolation.

All the functionality of NumericalMath`SplineFit`is now available in the newly created Splines Package.

All functionality is available in the newly created Hypothesis Testing Package.