I was going to say a few things about the 50th anniversary of the launch of Sputnik, but it looks like Phil Plait at Bad Astronomy already wrote a lot of stuff along the lines I was thinking!
Here's a NASA page (where I took the picture from) about the spacecraft and a Science@NASA page where you can hear the beep and learn more about communicating with spaceprobes, like the one on its way to Pluto.
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