The story of the "face on Mars" has been kept alive by the tabloids and UFO believers, who always see what they want to see, and disregard solid evidence to the contrary.
"Had I been in charge of the Mars Observer Program, the Cydonia region would have been one of my priorities for a high-resolution scan."
Arthur C. Clarke
Due to popular pressure, NASA wasted valuable resources by using the Mars Global Surveyor to take another picture of the formation in 1998.
Well here you are, Mr.Clarke!
http://www.suppressedscience.net/mars.html
That picture once and for all revealed the formation to be a natural landform. No scientist takes the "face" seriously.
NASA would be first to bang the bongos if they find something on Mars with a sufficient possibility of being artificial. If they could find such a thing, they would get more money for funding a massive Mars program than they could handle.