SymfonyLab

If you are starting new symfony/doctrine project its easy to dive into doctrine migrations (updating your production databases through a nice programmatic interface), here is some quick start manual:
http://particul.es/blog/index.php?post/Doctrine-generate-migrations-or-how-to-upgrade-your-database-in-production
And if you already have a project and want to bring migrations there look these great slides:
The Art of Doctrine Migrations

Using Doctrine Migrations