Greg,
NEC-2002 250.34(C) that requires the neutral to ground bond only if the
generator is a separately derived source. It is only a separately derived
source if the neutral of the sources are switched. See 250.20(D) FPN No1

"Greg" wrote in message
...
There are a couple of issues here.
Grounding the generator frame can be done via the Equipment Grounding
Conductor
in the cable you connect it with (to the building electrode). Certainly
driving
an additional rod when the ground thaws (~$10 plus about $5 worth of
hardware)
is a safer approach but it will still have to be bonded back to the house
via
the EGC.
The other issue is grounding the neutral. If your transfer equipment
switches
the neutral you will need to ground the neutral in the generator.
In most cases the transfer switch only transfers the hot legs so you leave
the
neutral isolated in the generator (as most portable generators are
shipped).
This grounds the neutral via your main bonding jumper in the service
panel.