I've always liked some of the 4 division ideas...especially if it means having a mini-playoff the last week of the year between 2 "pod" winners on the higher seed campuys with the winners playing in the conference championship.
My pods are a bit more straight forward:
Pod 1: Syracuse, UConn, BC, ND
Pod 2: Pitt (or Rutgers), Maryland, VTech, UVA
Pod 3: UNC, NCSt, Wake, Duke
Pod 4: Clemson, GT, Miami, FSU
The principal sticking point for Notre Dame in the ACC is keeping tradition rivalries (Michigan State, Michigan, Purdue, Southern Cal and Navy) on the schedule. Thus, it would be impossible for the ACC to have more than a 7-game conference schedule -- and that might not be enough to please ND.
In the midst of the 2003 expansion furor, the New York Post reported (inaccurately, as it turned out) that the ACC would go whole hog and become a 14-team league, with Syracuse and Notre Dame added to the current group of 12. If that's what the membership was like, you could put Notre Dame in one division, Syracuse in the other, switching them in two-year spans. Teams would play 7-game conference schedules -- the six teams within division plus a permanent cross-division rival (for ND, it would be Syracuse in this instance).
Would that be enough to placate ND? Probably not, but you never know.