The site generates stats daily and there is a 'Live score' against each player. You'll have to look at people's profile pages to work out which games are actually being played.
(Serious hat on)
Just a side note, I've taken one competitor out as he has a chipped 360. Anyone else who has one, please don't enter. The challenge is supposed to be a bit of fun and the result is based on balancing the following: Skill (Are you good enough to get the achieves?), Time (Just how long are you going to spend chasing that achieve?) and Resources (Can I really justify buying Avatar/Open Season/NBA 2K6?

).
'Less than legal' gamers could simply download a bunch of easy games and rack up a huge score in no time with little effort. So instead of spoiling it for the rest of us, please sit this one out. The fact that prizes have been donated makes the above even worse. If you really want those prize games, go download them, don't wreck the challenge.
(Serious hat off)