Matt Moore is starting for the Rays this afternoon, which is awesome. C.J. Wilson goes for the Rangers. For the Tigers and Yankees, it's Justin Verlander and C.C. Sabathia.
Pat has a good guide of who to root for. Basically, the Yankees (for obvious reasons), Phillies (Philadelphia!) and Cardinals (LaRussa) are the obvious villains. I'm rooting for a Rays and Brewers series.