Оформил: DeeCo
Автор: http://www.swissdelphicenter.ch

procedure GetKLList(List: TStrings);
 var
   AList : array [0..9] of Hkl;
   AklName: array [0..255] of Char;
   i: Longint;
 begin
   List.Clear;
   for i := 0 to GetKeyboardLayoutList(SizeOf(AList), AList) - 1 do
     begin
       GetLocaleInfo(LoWord(AList[i]), LOCALE_SLANGUAGE, AklName, SizeOf(AklName));
       List.AddObject(AklName, Pointer(AList[i]));
     end;
 end;

 procedure TForm1.FormCreate(Sender: TObject);
 begin
   GetKLList(ListBox1.Items);
 end;

 procedure TForm1.ListBox1Click(Sender: TObject);
 begin
   with Sender as TListBox do
     ActivateKeyboardLayout(Hkl(Items.Objects[ItemIndex]), 0);
 end;