Pokerroom
 

I am on a Mac as well which is why I play on PokerRoom. But it's a pretty decent site. Simple. Rarely have technical problems. I can use my ATM card to deposit money. Checks come relatively fast. The interface is decent. A lot of action. Not as many fish as other sites I think but there is still easy money to be had. A lot of different tourneys.

The bonuses are not that great, however, if that's important to you (IPOKER gives you a 40% deposit bonus). Clearing them isn't too bad. Stay away from blackjack! I've lost so much money there. But it's so tempting to lose a $20 tourney and figure you can win your entry back in one hand (usually doesn't work out that way).

Re: Pokerroom
 

At least in my experience, pokerroom has some bad technical issues (slowdowns) during peak hours. It becomes increasingly frustrating.