An excellent blog post on what to do if your MySQL database server isn't working right because an InnoDB table has been corrupted. I've used this process myself and it works like a charm. Knowledge of MySQL in particular and RDBMSes in general is required.
A somewhat silly site that talks about databases and basically tells you that if you have more than one user of any of them you're fucked. Links to what appear to be decent books on Amazon you can buy.