The Symfony blog points out a handy feature included with the latest release of the framework - a web debugging toolbar that gives you a quick summary of the stats for the current page.

The symfony web debug toolbar is one of the developer best friend. It is always conveniently accessible in the browser when using the development environment. It gives you everything you need to know about the current page and ease the debugging of your applications. Until now, all the information available in this toolbar were hardcoded. But as of symfony 1.2, the web debug toolbar is entirely configurable.

The toolbar contains information like: the version of the framework you're using, cache information, logging, memory usage and the execution time of the page. They also include a bit on how to customize your toolbar, adding and removing panels from the bar as well as changing up the look with styles.