On the PHP North West site they've posted a new video from this year's conference (back in October) of one of the sessions. In this new video Harrie Verveer presents his talk Database version control without pain.

We've all read the textbooks and are using version control systems for our code, but our databases are left out in the cold. Every team has their own workaround, ranging from patch files to SQL snippets in the bugtracker, but none is really robust. There isn't a silver bullet solution, but this talk will show you different approaches and solutions that you can use in different kinds of projects, helping you to handle the changes in your database structure in a more sophisticated way.

You can find the related slides here. There's also other great episodes on the PHP North West website.