http://www.google.com/mars/ or click on the telescope in google homepage heading : )
Cute! :)
http://news.bbc.co.uk/1/hi/technology/4804708.stm
Users of the Martian part of Google Earth will be delighted to hear that it has received enhancements. The new virtual-Mars features include historical maps of the red planet, and up-to-date imagery from spacecraft in orbit above it.
More: http://www.theregister.co.uk/2009/03/16/google_earth_mars_update/