Currently there are 59 native Telephoto Zoom lenses for Canon 40D and all of these lenses are autofocus (AF) type.
Canon 40D doesn't have a sensor based image stabilization system but 37 of these Telephoto Zoom lenses features optical image stabilization.
Since Canon 40D has environmental sealings (Weather Sealing), you may like to couple your camera with one of these 21 Telephoto Zoom lenses with Weather Sealings.