That is Earth and Moon taken from the Messenger probe last year, though it’s been wandering the blogosphere this week as Messenger successfully entered Mercury’s orbit. It’s a little brighter than the Pale Blue Dot, but equally cool.
Quoting from Carl Sagan:
Look again at that dot. That’s here, that’s home, that’s us. On it everyone you love, everyone you know, everyone you ever heard of, every human being who ever was, lived out their lives.