In response to southpaw777's comment:
I think the Yanks signed him because he was the best option for them. Certainly not to annoy the Sox. If any of their signings annoy the Sox, Im sure it was just a bonus and not the first reason to sign them.
Not sure what kind of info Youk can give the yanks that their people dont already know.
Either way, good for Youk. I hope he does well, except against the Sox.
Don't get me wrong, I love Youk and I think he's worth the money. I agree it's an added bonus to have a guy that knows their biggest competitor playing against them. But the fact remains, it is there. And there may be little indiosyncracies that people on other teams wouldn't necessarily know, but after Bobby, who made it a point to blab about any weaknesses on the Sox players I guess that point may be moot.
Whatever. I also hope he does well, except against the Sox.