I first heard about Moola.com about a year ago, but at the time the games that they had seemed much more luck-oriented than skill-based. However, since that time they have added some skill games, Gold Rush and Sports Betting in particular, that provide good players the ability to win without needing luck.
Moola.com bills itself as a Massively Multiplayer Rewards Game (MMRG) that is kind of like a free super-jackpot game show, where you start with a small free balance provided by their advertisers and sponsors. You start competing at the very lowest levels and if you win you double your balance. Over time, you build a bankroll by winning and through free spins of a Moola Booster wheel.
Their members have won real money and the current top player on the Leaderboard has over $8,000 in his account. If you like skill-based games and you don't want to risk your own money, I highly recommend playing at Moola.com.
My favorite game is Gold Rush, a 2-player game of strategy, in which the most clever bidder goes home with the gold! The objective is to reach 32 points through a series of betting rounds using your own 6 pieces of gold that are valued between 1 and 6 points. Each round the person with the highest bet takes that round of gold. There are various strategies for betting your multi-valued pieces and often your strategy changes depending on who you are playing (another good player or a weak player).
Check it out and good luck at the tables.