In a word, it was exhausting. But it was also cool from a technical point of view. Here's a still of us I grabbed from the video recording:

The screens in front of us are touch screens. I forgot how much fun it is to demo Hilo on a touch screen. Here's how it looked from my side (sorry about the lunch mess):

And a better view of all three cameras:

You can see that part of my job was to imagine people who wanted to learn C++ on the other side of those cameras. And finally, here's James hard at work getting something onto the demo machine:

I believe this picture immortalizes the moment he tweets about here: