Plus, FWIW, with MySQL I've had lots of table corruption issues over the years (although it's been a couple of years since then, so it might be more stable now).
Never had any issue with PostgreSQL.
Never had any issue with PostgreSQL.
This was on... crud, I don't really know what version off the top of my head, but it is on whatever Ubuntu ships with in summer 2009.
P.S. Have you checked your backups recently?