Trust me when I say this: Sell High.
Does anyone honestly think he will continue this kind of production. Even if he is for real as many are saying, there is still almost no chance of him continuing to pitch like he is. As others have said, he hasn't played a full season in who knows how long, so do you expect him to just come out of nowhere and become an ace?
His value is very high right now, so try to deal him for a struggling pitcher like Roy Halladay (it's a stretch I know, but someone out there would do it I'm sure), or Brandon Webb.