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{$IFDEF VER80} ShowMessage('Delphi 1');{$ENDIF}
{$IFDEF VER90} ShowMessage('Delphi 2');{$ENDIF}
{$IFDEF VER100} ShowMessage('Delphi 3');{$ENDIF}
{$IFDEF VER120} ShowMessage('Delphi 4');{$ENDIF}
{$IFDEF VER130} ShowMessage('Delphi 5');{$ENDIF}
{$IFDEF VER140} ShowMessage('Delphi 6');{$ENDIF}
{$IFDEF VER150} ShowMessage('Delphi 7');{$ENDIF}
{$IFDEF VER160} ShowMessage('Delphi 8');{$ENDIF}
{$IFDEF VER170} ShowMessage('Delphi 2005');{$ENDIF}
{$IFDEF VER180} ShowMessage('Delphi 2006');{$ENDIF}
{$IFDEF VER185} ShowMessage('Delphi 2007');{$ENDIF}
{$IFDEF VER200} ShowMessage('Delphi 2009');{$ENDIF}
{$IFDEF VER210} ShowMessage('Delphi 2010');{$ENDIF}
{$IFDEF VER220} ShowMessage('Delphi XE');{$ENDIF}
{$IFDEF VER230} ShowMessage('Delphi XE2');{$ENDIF}
{$IFDEF VER240} ShowMessage('Delphi XE3');{$ENDIF}
{$IFDEF VER250} ShowMessage('Delphi XE4');{$ENDIF}

if CompilerVersion = 20 then sCompilerName := 'Delphi 2009';

or in conditional compiler expressions:

{$if CompilerVersion > 18} // Delphi 2007 or later {$ifend} 

Compiler 	      CompilerVersion 	Defined Symbol
Delphi XE4		25 		VER250
Delphi XE3		24 		VER240
Delphi XE2		23 		VER230
Delphi XE		22 		VER220
Delphi 2010 	  	21 		VER210
Delphi 2009		20 		VER200
Delphi 2007 .NET 	19 		VER190
Delphi 2007 		18.5 	VER185
Delphi 2006 		18 		VER180
Delphi 2005 		17 		VER170
Delphi 8 .NET 		16 		VER160
Delphi 7 		15 		VER150
Delphi 6 		14 		VER140
Delphi 5 		13 		VER130
Delphi 4 		12 		VER120
Delphi 3 		10 		VER100
Delphi 2 	      	9 		VER90
Delphi 1 		8 		VER80