Since Version 5.0 (released in 2003), SingularValues has been superseded by SingularValueList and SingularValueDecomposition.
As of Version 6.0, SurfaceGraphics has been superseded by GraphicsComplex and related functionality.
As of Version 6.0, TextStyle has been superseded by BaseStyle, LabelStyle and other options.
As of Mathematica 7, ToFileName has been superseded by FileNameJoin.
As of Version 3, $DefaultFont has been superseded by settings in notebook stylesheets, and as of Version 6 by options such as BaseStyle.
As of version 6.0, $FormatType has been superseded by explicit settings for FormatType in Graphics and related functions.
As of Mathematica 7.0, $TemporaryPrefix has been superseded by $TemporaryDirectory.
As of Version 6.0, $TextStyle has been superseded by BaseStyle and other options.