MySQL go away already
I used to hold Monty in high regard - a successful entrepreneur who gets open source. In open source the best product wins, and the license should make sure you don't have to play the games Monty is now engaged in. Unfortunately for Monty the better product is not a MySQL fork.
I started learning about databases with MySQL and it was a good trip, but I've come to see the light. The only thing it has over PostgreSQL is mindshare - unfortunately when people think open source web application platform they think "LAMP stack", ergo MySQL.
Oh, and when you do replace MySQL also make sure you drop PHP or Perl in favour of Python. You'll never look back.