Katy,
> Yes, 'postgres' is the only line in pg_user.
Wow. Frankly, I'm not sure how it's possible to install postgresql without a
superuser. Perhaps your tech accidentally made himself the superuser, then
deleted his account to "fix" it?
In any case, I think re-installation will be your easiest way to fix this.
--
-Josh Berkus
Aglio Database Solutions
San Francisco