Last week, the NetBeans team
announced that the next version of their IDE (6.8) will have native support for symfony! That's a great news for all of us.
They have a dedicated page in their Wiki about symfony support in NetBeans, and the NetBeans 6.8 nightly builds already have some basic support for symfony, like the ability to run a task.
To learn more, read Tomas Mysik's blog post about what is already available.