Be careful with this one. The $300 takes forever to clear unless you're playing $2/4 or better. Interpoker often changes the terms of their bonus too. My $300 turned into $154 when they changed the definition of raked hands. Explanations was that the bonus had 'expired'. This was a PL3000 bonus which was not supposed to have any expiration date.

The monthlies and occasional promotions like their SS2 promotion seem good. Monthlies have worked well for me but their special promotions are always problematic. (search for the thread on difficulties with SS2 promotion.) Ryan Hartley and the customer service crew seem like they mean well but they've screwed up enough times that I won't even play there for the juicy monthly bonuses anymore.

Edit: The $20 for one hand bonus also works, and the weekend bonuses are good. I haven't tried the KK or A8 promotions but I hear that the claim form is a bit of a hassle.