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Код:

{
      THIS IS A SAMPLE, HOW TO SET YOUR TASKBAR TRANSPARENCY VALUE
                            Noviyanto Wibowo
                          http://opxbit.web.id
                           info@opxbit.web.id
                          mockheroicx@yahoo.com

}

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms,
  Dialogs, ComCtrls, StdCtrls;

type
  TForm1 = class(TForm)
    Button1: TButton;
    GroupBox1: TGroupBox;
    barX: TTrackBar;
    Label2: TLabel;
    Label1: TLabel;
    procedure barXChange(Sender: TObject);
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure SetTaskbarTrans(n :Byte);
var
   targetHwnd,xHwnd: hWnd;
begin
  targetHwnd := FindWindow('Shell_TrayWnd','');
  if targetHwnd <> 0 then
  begin
    xHwnd := GetWindowLong(targetHwnd,GWL_EXSTYLE);
    SetWindowLong(targetHwnd,GWL_EXSTYLE,xHwnd or WS_EX_LAYERED);
    SetLayeredWindowAttributes(targetHwnd,0,n,LWA_ALPHA);
  end;
end;

procedure TForm1.barXChange(Sender: TObject);
begin
  Label2.Caption:= IntToStr(BarX.Position);
  SetTaskbarTrans(BarX.Position);
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  BarX.Position:= 255;
end;

end.