Jonathan Coulton tweets that following his triumphant huge success with Still Alive, the theme from Portal, he is also supplying a song for Portal 2, though his airplane flight today put his work on the platformer sequel in jeopardy: "If this plane goes down, the Portal 2 song goes with it. It is in my pocket..." He later followed up with word that no tragedies ensued: "Good news, I did not crash. Christmas is saved." Thanks Eurogamer.