Like its historical imagery, Google Earth 5.0’s Mars features have been updated not very long after the launch of Google Earth 5.0. In addition to layers showing historical maps of Mars (like Schiaparelli’s) and narrated guided tours (that really do work as an introduction to all the Mars material), there is something called Live from Mars that provides imagery that, while not exactly live, is certainly fresh — imagery from orbiting probes can be viewed within hours of being taken. See Google’s announcements on the official blog and LatLong; see astronomers’ take on all this at Astronomy, Bad Astronomy and Universe Today; and, of course, see Google Earth Blog. By now, the short introductory video from Google is de rigueur: