I got this idea from another forum that I visit. I will link to them, not to advertise but out of respect for the original idea.
Anyway. Basically if you have achieved the full 200 or 250 in a XBL Arcade game, please post in the sign up thread (here) to have your name added to the list.
Now onto the Games, these will be added as and when people sign up:
Spoiler for Cloning Clyde:
Spoiler for Uno: