Start digging for Monoliths on the Moon!
http://www.nature.com/news/2004/040830/full/040830-4.html
If an extra terrestrial wanted to send a field report describing all she had learned about Earth, she might be better off writing rather than phoning. A new analysis has concluded that a physical object would be a more efficient way to send a long message to the stars than a beam of radio waves.
