I'm also going to do Tennessee. None of the other states seem very predictable or interesting (besides Georgia, but that'd be a mess of all the counties and because I'm not sure where exactly Gingrich's suppose base is in the state.)
It's a mess, but here's a rough outline of what I'm thinking. I could be wrong, but I don't think Santorum will carry more than a couple of rogue counties with maybe 28-30% of the vote. I haven't even seen a Santorum ad here.
Newt's old congressional base is centered due north of Atlanta (Bartow, Cherokee, Forsyth), but he'll probably do better in some of the more conservative areas to the north and west of it, as well as in the southeastern interior.