Guys, after all these months the FCC still hasn't said "boo". (Although, perhaps they will on the 31st?)
But the ARRL's Laboratory Manager and RFI specialist, Ed Hare W1RFI, has shed some light on this.
"...above 30 MHz, the device has radiated emissions limits. That is 100 uV/m 3 meters from the source, or +40 dBuV/m. To put that in perspective, on VHF television, a "Grade B" signal on channel 2 is +47 dBuV/m so the signal from the unlicensed device is only 7 dB less than the TV signal in the clear. If that unlicensed device is being used indoors near a TV with rabbit ears, interference is inevitable."
Simply put, the FCC ClassB certification limit is apparently so high at VHF frequencies, that a ClassB certified device can and will squeal like a pig and still be in full compliance. The fact that most home computing devices create no problem at all, is apparently a credit to DEC, COmpaq, HP, IBM, and the many small shops that manage to build much more complex devices--which don't create any RFI at all.
And a further credit to those fine folks who say "HI! We're from the government and we're here to help you!"