Once teams qualify for the knockout stage there is a bracket. The bracket could be filled out like an NCAA one. http://en.wikipedia.org/wiki/2010_World_Cup
I see, well I think doing game by game is better and more fun. It's 3 games daily for the first few days than goes to 4 games I think for about a week, then the knockout stage.
ESPN has a predictor. You pick the group stage winner and runner up and it goes through to the bracket after that. http://games.espn.go.com/bpredictor/en-us/frontpage There's no way to specifically predict group stage games though.
We'll just do game by game, meaning US vs England, we choose the winner and try and predict score, if you get it right you get points, if you get even the score right you get bonus points, and so on. So it's only 3 to 4 games (later only 2) daily.