To be fair to you, we are presenting a list of likely challenges that will be presented during the game.  We reserve the right to change or withdraw any of these challenges at will.  After all, we are the host and you are just guests in our awesome game :)

challenge 1
The game will commence with two tribes of eight people. You will be required to work as a team to build a flag which will be judged to determine the winner. The losing tribe will go to tribal council and vote someone out.

challenge 2
The next challenge the tribes will be required to create a webpage which is an "SOS". Each tribe's page should have a hitcounter because the winner of this challenge will be the tribe with the most hits at the end of the time allowed. The losing tribe will go to tribal council and vote someone out.

Once there are 14 people in the game, the tribes will be divided into 3....how will 14 be divided by 3 you ask? Well nobody said all tribes had to be the same, so I will roll a three-sided dice to decide which tribe you are in...

challenge3
the next challenge will be a relay race. The tribe will have to pass a single email between each person in the tribe in order. The tribe that has the most successful passes will win immunity, and the other two tribes will both go to TC.

challenge4
at this point with 12 people left, we will have a reward challenge. (anyone good at endurance challenges? I have a special button in mind). The winning individual will be faced with a choice. They can either 

(a) boot any individual in the game,
(b) switch the tribes around any way they please, so long as the tribe numbers remain constant, or
(c) bring back any individual already booted out previously, choosing which tribe that person will join.

challenge 5
challenge 5 will be one of those really annoying polls like a bravenet thing, we've all seen them.... you know how it works.

challenge 6 
this challenge will be a survivor trivia quiz. boring. I know it's been done before.

.......now we merge.

challenge 7
the next challenge will be a ranking thing, where you rank all the players in the game. the least popular and most popular will both be immune.
challenge 8
this is another reward challenge. The winner may pick any of (a) (b) or (c) from the last challenge that hasn't yet been done, but (b) is now "give anyone you like immunity to the final 4 (except you cant keep it yourself).

challenge 9
this challenge is a pick a number thing. the winner of this challenge will not only be immune, but they will be given a double vote, which they can save until later, or use it anytime til the final 4.

challenge 10
the players will be split randomly into two groups. Each group will be given a yahoo group, and the winning group will all score immunity. they will win by gathering the most members for their group from amongst the poor innocent put-upon masses in the ORG community.

challenge 11
the winner of this challenge will not only be immune, but they will be given a double vote, which they can save until later, or use it anytime til the final 4. The players gather in chat, and pass around the immunity necklace, until the host calls time. whoever is holding the necklace at that time is immune.

challenge 12
Viewers choice.  In the forums, anyone will be free to request a challenge, and the one that gains the most support will be used here. 

challenge 13
players will gather in a chatroom and all type, the host will turn her back, and when she says stop, the person who spoke last, just before she says stop, will win immunity

challenge 14 (this may not be required)
dice roll to determine winner.