Looks to me like 210.7.C is new to the 2002 NEC. The passage has a vertical line along its side.
I was into the pleasure of a couple strong cups of coffee yesterday when my engineer side ran amok (beware the dark side) and I came up with the two hots from the same bus idea over in the combo fan thread.
I realized later that the material available from the manufacturer probably limits the building of my idea a bit. I mean, I could built this with safety switches or fuse panels with pull outs that are field connected to the bus, but circuit breakers seem to be a problem. In the few places I've looked, I can't find handle ties that are listed for a single tandem breaker. And what about two 240V circuits to a duplex. . .what kind of handle tie works with two pole breakers?