Moola

Moola is a Canadian based online gaming site in beta test which is currently opened to US and Canadian residents. Players receive free credits to wage against other players in return for watching a 10, 15 or 30-second video advertisement and answering a trivia question related to the ad. By extending credits to the viewer of the advertisement, players have funds to place bets against other players without risking any of their own money. These player may then 'cash out' the accumulated winnings for real cash once the equivalent of $10 USD has been reached.

Moola also gives away additional credits for using the website's "Search and win" search bar. Registered users search any topic of interest through this search function and have the theoretical opportunity to win up to $36,000 per day.

Moola ranked 11th on PCWorld magazine's "The 15 Best Places to Waste Time on the Web" in 2007.

Thats what wikepede says. I suppose that might have given you a clear idea about the game. If you are a gamer and you are from U.S or Canada this is your best way to earn money.
Here is the link
Moola