"Rick Schumeyer" <rschumeyer@ieee.org> writes:
> (red face) It seems I might possibly have neglected to kill the
> postmaster from 7.4 before installing 8.0.
Ooops ;-). If you didn't already, I'd suggest wiping and re-initdb'ing
the PGDATA area. It's possible that the 7.4 postmaster corrupted things
before you killed it.
regards, tom lane