I'm pulling for the Ravens, but I'll be very surprised if they win today.
Baltimore has been riding the wave of emotion surrounding Ray Lewis' retirement, but I don't think it can carry them past the Pats. Flacco is not as bad as many people think, but he's nowhere close to Brady and barring some freak injury, I think New England wins without too much trouble.
My opinion of the Pats at mid-season was based on what looked at the time at least, to be a rather porous defense. They seem to have that sorted out now, so I think they make to the big dance yet again.
However, I like the Niners' chances against them. I think you might want to cheer for Atlanta...