The symfony project asks the community on their blog what sorts of projects they're using the framework for:
We are trying to get a better view of the use of symfony, and of what people think are its strongest and weakest points.
If you have five minutes to spare, we'd love to have your feedback on the matter. There is a poll thread in the forum where you can express your opinion.
If you're a user of the symfony framework, be sure to head over to the post and grab the list of questions they'd like to hear about. Tons of developers have already responded, so add your answers today!