Lewis was actually rolling around the Emerging Technologies area of SIGGRAPH this year and I got to talk quite a bit with some of the folks that were following him around to make sure he didn't get into any trouble and explain how it worked. (Which is good, because it's just this big red column looking thing and doesn't look particularly friendly)
The photos it "composed" were actually quite good as it would use the rule of thirds when trying to set up a photo. The only real problems I saw with it from a tech standpoint was that the lighting in that area of the convention center was a bit yellow so their white balance was off and the robot had the embarasing habit of totally ignoring anyone with very dark skin. At the time I was talking to a student from a local school who was there who happend to be black and we let the robot take a few pictures of us... when we went to look at the pics every single one of her was cut off as she was basically being ignored as "background".
The other problem were the batteries - I saw them change the batteries on the 'bot once and there were a *LOT* of what appeared to be very heavy lead -based batteries - they looked like motorcycle batteries, but I'm not sure. Apparently the bot lasts for a few hours on a single charge, but then you have to swap out all of its batteries (I think there were at least 5 of them)
