I ran a Survivor game once on a forum, turned out to be good fun.
Only problem is you need around 16 players.
I'd be happy to run another one if interest is in it.
Doesn't necessarily have to be Survivor themed
Starts off with 2 teams of equal amounts
Each week there is a specific challenge, could be a quiz, a challenge to make a website/video/banner etc judging could be a number of things - correct answers, hits on youtube, a judging panel etc
Winning team gets immunity
Losing team have to vote someone out of their team/tribe.
When it gets down to say 10 players, merge the teams and it becomes an individual thing. Winning player for the challenge gets immunity and cannot be voted out.
When just two left, the last 7 voted out cast a vote each on who they think should win, this could come down to who played the game better, who was most honest, who did well in challenges. It's completley individual.
It can get quite canaving ala the TV show as you wanted to win! Lots of people lied, most got caught. The furthest I ever went was 3rd