As of Version 6.0, NotebookCreate has been superseded by CreateDocument, CreatePalette, and related functions.
As of Version 6.0, PolygonIntersections has been superseded by various options for Export.
Since Version 5.0 (released in 2003), SingularValues has been superseded by SingularValueList and SingularValueDecomposition.
As of Mathematica 7.0, $TemporaryPrefix has been superseded by $TemporaryDirectory.
BarStyle
(Obsolete Bar Charts Package Symbol) As of Version 7.0, BarStyle has been superseded by ChartStyle.
As of Version 7.0, DTFourierTransform has been renamed to FourierSequenceTransform and is part of the built-in Mathematica kernel.
As of Version 7.0, FourierCoefficient is part of the built-in Mathematica kernel.
As of Version 7.0, FourierCosCoefficient 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, FourierSinCoefficient is part of the built-in Mathematica kernel.