[marcoszorrilla]

En cuanto a lo del formulario transparente prueba con este código de ejemplo:

procedure TForm1.Button1Click(Sender: TObject);
var
  frmRegion, tempRegion: HRGN;
  i: Integer;
  Arect: TRect;
begin
  frmRegion := 0;
  for I := 0 to ControlCount - 1 do begin
    { create a region for the control }
    aRect := Controls[i].BoundsRect;
    { coordinates have to be window-relative, not client area relative }
    OffsetRect( aRect, clientorigin.x - left, clientorigin.y - top );
    tempRegion := CreateRectRgnIndirect( aRect );
    { merge the region with the "summary" region we are building }
    if frmRegion = 0 then
      frmRegion := tempRegion
    else
    begin
      CombineRgn( frmRegion, frmRegion, tempRegion, RGN_OR );
      DeleteObject( tempRegion );
    end;
  end;
  { create a region for the caption and menu bar and add it to the summary }
  tempregion := CreateRectRgn( 0, 0, Width, GetSystemMetrics( SM_CYCAPTION )+
                              GetSystemMetrics( SM_CYSIZEFRAME ) +
                             GetSystemMetrics( SM_CYMENU ) * Ord(Menu <> Nil));
  CombineRgn( frmRegion, frmRegion, tempRegion, RGN_OR );
  DeleteObject( tempRegion );
  SetWindowRgn( handle, frmRegion, true );
end;

Libros descargables La Cara Oculta de Delphi 4

No tengo ahora la dirección a mano, sino lo encuentras me lo comunicas.

Un Saludo.