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var
  zeilennummer:Integer;

...

procedure TForm1.ListBox1MouseDown(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
begin
zeilennummer:=listbox1.ItemIndex;
end;

procedure TForm1.ListBox1MouseUp(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
begin

if (x>listbox2.Left-listbox1.Left) and (x<listbox2.Left-listbox1.left+listbox2.Width) then
if (y>listbox2.top-listbox1.Top) and (y<listbox2.top-listbox1.Top+listbox2.height) then
listbox2.Items.Add(listbox1.Items[zeilennummer]) ;
end;                    

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screen.cursor:=crhandpoint;                    

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screen.cursor:=crdefault;                    

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procedure TForm1.ListBox1MouseDown(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
begin
     if Button = mbLeft then Listbox1.BeginDrag(false);
end;

procedure TForm1.ListBox2DragOver(Sender, Source: TObject; X, Y: Integer;
  State: TDragState; var Accept: Boolean);
begin
     if Source is TListbox then Accept := true;
end;

procedure TForm1.ListBox2DragDrop(Sender, Source: TObject; X, Y: Integer);
var
   i : Integer;
begin
  if Source is TListbox And (Listbox1.SelCount > 0) then
  begin
    for i := 0 to Listbox1.Items.Count-1 do
    begin
      if Listbox1.Selected[i] = true then
         Listbox2.Items.Add(Listbox1.Items.Strings[i]);
    end;
  end;
end;