One possible division is to have:
New England, which according to Wikipedia (
http://en.wikipedia.org/wiki/New_England) includes Maine, New Hampshire, Vermont, Massachusetts, Rhode Island and Connecticut. And having experioenced some people's attitudes when you lump even New York into New England will instruct you on the error of your ways.
The rest of the current Northeast forum could be the new Mid-Atlantic. Possibly adding in VA and WV.
Although, those south of the Mason-Dixon line may be considered by some to be South, I think to even things out, including a couple of other states under the generic term Mid-Atlantic makes sense.
EDIT: I also think there is at least a small chance that shrinking the regions to a fewer number of states might increase traffic.