Google Earth 5.0 now includes a new mode dedicated to Mars called Mars in Google Earth that let Martians see 3D views of Valles Marineris on Mars, easy access to visible and infrared global maps, can search for and view Martian landmarks, like the face on Mars. Last, and easy to follow NASA rover tracks and view 360-degree panoramas of the Martian surface, taken by the rovers.
The rover panoramas are displayed in Street View style, allowing you to both pan around and zoom all the way in to see details. So download the latest version of Google Earth, and check out the new "planets" button on the toolbar to see Mars in all its 3D glory.
To initiate chat, open the latest version of Google Earth, switch to "Mars" and search for "Meliza". Click on the small robotic icon and you'll be able to chat with Meliza, a friendly relative of Eliza, one of the first chat bots. A message informs Earthlings that "Meliza is using an account on a different planet. There may be translation errors." The chat bot has some predefined text related to Mars and it can't answer to many questions, but it's always ready to rephrase your messages.