Symfony is a web application framework for PHP projects.
The symfony advent calendar is a set of 24 tutorials, published day-by-day between December 1st and Christmas. That's right, every day a new tutorial will be published. Each tutorial is meant to last less than one hour, and will be the occasion to see the ongoing development of a web 2.0 application with symfony, from A to Z.
For Christmas time, the resulting application will be put online, and the source code made open source. This application will be usable, interesting, useful, and fun.