Here's yet another fine preview of the inevitable robot apocalypse -- car-assembling arms in the city center overlooking us feeble humans. For now, though, these machines are merely part of an Kram/Weisshaar art installation dubbed Outrace. Throughout the week-long London Design Festival, you can go to Outrace.org to submit a short text message that you wish to be displayed in Trafalgar Square, and with a bit of luck, the monitoring staff will pick up your greeting. What happens next is that the eight LED-equipped Audi robot arms will start scribing your