"But...but...I thought this was an Astros blog..." is what you may be thinking. And you're correct. How does the Yankees signing Jason Johnson to a minor-league contract with the intention of having him compete for the 5th starter job affect the Astros? Let's look at who the Yankees have in the rotation right now:
C.C. Sabathia, A.J. Burnett, C.M. Wang, Joba, Jason Johnson
You know who is not on that list? Honest Andy Pettitte. Of course, you can't count on Johnson actually getting that 5th spot. If Andy decides he is willing to try living on $10 million, he'll be in the rotation.
But Andy has given ultimatums and the Yankees have given ultimatums. So this doesn't look like it will end well.