The winner of the Mars Phoenix Lander twitter epitaph contest held by Wired magazine is "Veni, vidi, fodi" [right, credit Wired.com] or "I came, I saw, I dug."
The list of both popular and editorial favorites, along with nearly 1,000 twitter entries is online at the Wired.com site.
My entry of "Rosebud." scored a magnificent -2, which was good enough to put me in the top 25% or so.