You pretty much do the same as the above mentioned sites and once you make over 500 points you can request a game from steam, 100 points is the same as $1 USD.
If your having trouble logging in try logging in on the terms page
Here is a video that shows the prizes that the owner has already given.
Link to vid
I recently got my first game , it took one day for me to get it.
Got my Second game!
Please sign up using the following link
Free Steam Games
And just in case here are other links to:
Edited by car7235, 08 December 2010 - 09:49 PM.