There are 3D models of the landers (check out the Viking landers for example) sitting on the surface as well as photos of them from orbit. Beagle-2 crash site still hasn't been tracked down yet though.
As a bonus feature, there are also historical maps of Mars including Percival Lowell's view with all the canals and "Martian cities" that can be seen.
To see the Mars features, you need Google Earth 5.0 and then simply click the planet icon and pick Mars.
| Google Earth 5.0 |