Looks like as of an hour or so ago you can start mining dogecoin over there. I just pointed a few MH/s to try it out. As of right now, it doesn't look like they have added the Dogecoin as a balance/wallet on CEX.io yet. So I'm not sure how you get your Dogecoin after you mine a block. I'm currently helping mine their second block right now. Will report back soonish...