PlayersOnly Poker is an up and coming room on the Cake Poker Network. Being on the Cake Poker Network allows them to still accept players from the United States and they claim one of the highest credit card acceptance rates in the industry. They offer a giant 100% up to $500 sign-up bonus that is deducted from your MGR at a rate of 33%, so you'll still be getting rakeback on top of the bonus. They also offer regular reload bonuses, nearly one per month, so you can keep your bonus account topped up. PlayersOnly Poker uses the 'dealt' rakeback method so you'll be getting credit towards your MGR whether or not you stay in the hand.
PlayersOnly Poker has many great promotions available to their players. They have a "Gold Chip Reward Program" in which you earn "Gold Chips" based on the number of Frequent Player Points that you collect in each month. These chips can be redeemed for a variety of things including tournament entries. They are also running a series of freerolls until July 2008 giving away $100,000 every month for a total of $1,000,000! You can qualify for the monthly freeroll by using Gold Chips to enter into satellites.