Google's developer conference in San Francisco, Google I/O, is a temporary geek paradise, a replication of the Googleplex's lavish perks. Flight of the Conchords played last night. Google also provided puzzles. TechCrunch editor Michael Arrington noticed that a binary code sequence on Google's T-shirt for the event spells "GOOGLE KO". A mistake? Or a test to see if readers are clever enough to notice that the top half of a "K" looks like an "I" and a slash?