As announced on the symfony blog today, Doctrine now has "citizenship" in the framework with the release of the sfDoctrinePlugin:

Today, Doctrine gained its citizenship in symfony 1.2. The sfDoctrinePlugin was linked via externals and is now officially bundled with symfony. If you've been around for a while, you'll know that this was highly anticipated and is a long time coming. To celebrate, I'll give a short little tutorial on how you can get started using Doctrine in symfony. Read below if you're interested.

The post gives you a brief introduction to how to load and use the Doctrine plugin, including how to build out an application automatically via the symfony binary.