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).
I have heard about the MySQL table corruption thing before, but frankly I'm not exactly a database expert and never really worried about it. Then one of the critical tables backing Bingo Card Creator died, hard. (Thank God it was on the staging server, not on production.) I still have no clue why, and was unable to recover anything from it -- I ended up having to restore from backup.
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.
Never had any issue with PostgreSQL.