Bob, went on one last week, someone ran a 3 circuit, one nuetral to multiple outlets, simlilar to what the poster is asking.
Aparently, a nuetral connection came loose in a recptacle box. All the surge protectors plugged in smoked and melted, the printer/copier burnt up, and needed boards, fire dept called, the whole mess.
For the cost of wire, and the potential for disaster, I don't do it.
Just for fairness, multiwires are good for lighting, if both circuits are matched closely.
Dnk...
