As of Mathematica 7, ChebyshevDistance is superseded by ChessboardDistance.
As of Version 6.0, ClipFill has been superseded by the more general option ClippingStyle.
As of Version 6.0, ContourLines has been superseded by settings for ContourStyle.
As of Version 6.0, ConversionOptions is superseded by capabilities in Import and Export.
As of Version 6.0, DefaultColor has been superseded by the more general option BaseStyle.
Display
(Obsolete Mathematica Symbol) As of Version 6.0, Display is superseded by capabilities in Export.
As of Version 6.0, DisplayString is superseded by capabilities in ExportString.
As of Version 6.0, FactorComplete has been superseded by FactorInteger[n, All] and FactorInteger[n, Automatic].
As of Version 6.0, GraphicsArray has been superseded by GraphicsGrid and Grid.
GridBaseline has been superseded by the BaselinePosition option for Grid and related objects.