The ZendCasts.com site has recently posted a quick video covering logging and Doctrine event listeners in a Zend Framework application.
This short video is going to be the last in my 2009-2010 series on Doctrine 1.2. I'm wrapping it up with a little example of adding timestamps, logging and using Doctrine's event listener architecture.
The tutorial shows you how to pull in the features of Doctrine to make it easier to create a more complex logging system. He shows how to set up the schema file, add in controller functionality and backend models to make things all work together happily. You can get a copy of the project he's building from his subversion repository.