Hello from Earth: Send a Message to a Nearby Planet

Hello from Earth! is a program by COSMOS, an Australian science magazine. Using the Canberra Deep Space Communication Complex, it will transmit Internet user-submitted messages to Gliese 581d, a potentially Earth-like planet approximately 20 light years away. You have until August 24th to submit your 160-character message. Registration is required.

What message would you send to this distant planet?

http://www.hellofromearth.net/gliese581d/home/index.htm via Geekologie