I just took the dive and joined Doyle's Room (www.doylesroom.com) just so I could get the free Super System 2 book. I was pleasantly surprised with the interface. I deposited $100 and started playing $1/2 limit holdem on there. Wouldn't recommend that to everybody since it is a higher variance to the bankroll (about 50x the Big Bet), but I wanted to rack up some Action Points to earn the book. You need 10,000 action points for the book. After about 7 hours of play I have 1400 Action Points and I am up $120. So I would highly recommend Doyle's Room as a place to play online poker. If you do sign up there, mention in the registration process that JJDude is the person that referred you. I think we both get some sort of referrer and referree bonus.

Source: Poker and Life