On the Tales of a Coder blog there's a recent post about DocBlox, an alternative to the usual phpDocumentor for generating automatic documentation, and how it made it "pain free" for her current project.

Want to generate documentation for your PHP project, but keep putting it off? Can't be bothered wading thigh deep in documentation, screaming WHY WON'T IT WORK as you try to set it up? Look no further. DocBlox is pain free and you'll be up and running, literally in a few minutes.

She includes a guide to getting the latest DocBlox installed and configured to work with your project. The configuration is a straight-forward XML file, so changing the settings to match your needs is easy (more on the config here). Once this is configured, building your documentation is one command away. For more details on DocBlox, check out the project's website.