I have never heard of ChinaJoy before. Also known as China Digital Entertainment Expo & Conference, apparently, it is the world’s largest digital entertainment expo focusing on online games. The expo showcases various games on PC, console, mobile platform and is well known for its hot Chinese booth girls.
I think I have to go to ChinaJoy next year! More photos can be found in these Flickr photosets here, here, here and here.